Browse Acronyms
Browse the acronym list:
L Listing
L
– chemical blister agent (Lewisite)
– lambert [convert to SI: candelas per square meter (cd/m2)]
– liter [cubic meter (m3) is preferred; a liter is equivalent to a cubic decimeter (dm3); the use of liter is discouraged and is restricted to volumetric capacity, dry measure, and measure of fluids (both gases and liquids); use only milli- (m) or micro- (µ) as prefixes with liter (L); sometimes "liter" is acceptable]
L&GWOD
Liquid and Gaseous Waste Operations Department (ORNL)
L-G
line to ground
L-L
line to line
L.M.
load management
l.u.b.
least upper bond ("LUB" is preferred) (math)
L/D ratio
length-to-diameter ratio
La
lanthanum (element, Z = 57)
LA
Louisiana (use only with ZIP code addresses)
La.
Louisiana (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text; state name is not needed with New Orleans)
LAA
limited access area
LAAO
Los Alamos Area Office (DOE)
LAB
Library Advisory Board
LABCOM
U.S. Army Laboratory Command
LACE
Light-Water Reactor Aerosol Containment Experiment
LAE
least absolute error
LAER
lowest achievable emissions rate
LAF
Lake Acidification and Fisheries (EPRI)
LAI
leaf area index
LAM
local air monitor
LAMP
–Lake Acidification Mitigation Project (EPRI)
– LODE Advanced Mirror Program
LAMPRE
Los Alamos Molten Plutonium Reactor Experiment
LAN
local area network
LANDSAT
land satellite (photographs of ground)
LANL
Los Alamos National Laboratory (formerly Los Alamos Scientific Laboratory)
LANMAS
Local Area Network Material Accounting System
LANTIRN
low-altitude navigation targeting infrared night
LAP
Laboratory Accreditation Program (DOE)
LASER
light amplification by stimulated emission of radiation
LASL
Los Alamos Scientific Laboratory (now Los Alamos National Laboratory)
lat
latitude
LATA
Los Alamos Technical Associates
LAW
low-activity waste
lb
– pound, avoirdupoise (16 oz) [convert to SI: kilogram (kg)]
– pound, troy (12 oz t) [convert to SI: kilogram (kg)]
– pound, apothecary (12 oz ap)[convert to SI: kilogram (kg)]
lb-ft
pound-foot [convert to SI: kilogram-meter (kg-m) or newton meter (N· m)]
lb-in.
pound-inch [convert to SI: kilogram-centimeter (kg-cm)]
lb-mol
pound-mole [convert to SI: kilogram-mole (kg-mol)]
lb/ft3
pounds per cubic foot [convert to SI: kilograms per cubic meter (kg/m3)]
LBAD
Lexington-Bluegrass Army Depot
lbf
pound force [convert to SI: newton (N)]
LBL
Lawrence Berkeley Laboratory (University of California) (now LBNL)
lbm
pound mass [convert to SI: kilogram (kg)]
LBNL
Lawrence Berkeley National Laboratory (University of California) (formerly LBL)
LBU
Laboratory Business Unit
LC
– Library of Congress
– line-commutated (inverter)
– liquid chromatographic
– load characteristics (computer term)
LC-SEM
Large Chamber Scanning Electron Microscope
LC50
median lethal concentration (lethal concentration for 50% of a given population) (see EC50, LCLO, LD50, and LDLO)
LCA
– life-cycle analysis
– Logistic Control Activity (U.S. Army)
LCAM
Life Cycle Asset Management
LCB
Laboratory Coordination Board
LCBWS
load-cell-based weighing system
LCC
– Laboratory Communication Center
– Large Cavitation Channel (USN)
– life cycle cost
LCCDAAS
Large Cavitation Channel Data Acquisition and Analysis System (ORNL developed for USN)
lcd
least common denominator ("LCD" is preferred) (math)
LCD
– least common denominator (preferred over "lcd") (math)
– limiting conditions document
– liquid crystal display
LCF
latent cancer fatality
LCFS
last closed flux surface
LCLO
lethal concentration low (lowest concentration that is lethal) (see EC50, LC50, LD50, and LDLO)
LCM
life cycle management
lcm
least common multiple (math)
LCMM
Least Cost Mix Model
LCO
– laboratory certification official
– limiting conditions for operation
LCP
– Large Coil Program
– liquid crystalline polymer (molecular composite)
LCR
– load collector ratio
– load control receiver
LCRS
Leachate Collection and Removal System
LCS
limiting control setting
LCT
Large Coil Task (ORNL)
LCTF
Large Coil Test Facility (ORNL)
LCU
– load control unit
– local control unit
LCUP
Least-Cost Utility Planning Division (of DOE)
LD
– Legionnaires' disease
– low density
LD/DCC
laser diagnostic/data concentrater and controller
LD50
median lethal dose (lethal dose for 50% of a given population) (see EC50, LC50, LCLO, and LDLO)
LDA
– laser Doppler anemometer
– local density approximation
LDAP
Lightweight Directory Access Protocol
LDB
legislative data base
LDC
less-developed country
LDF
Laser Demonstration Facility (LLNL)
LDLO
lethal dose low (lowest dose that is lethal) (see EC50, LC50, LCLO, and LD50)
Ldn
average day/night sound level
Ldn y-avg
yearly average day/night sound level
LDPE
low-density polyethylene (also PEL)
LDPEX
cross-linked, low-density polyethylene (also PELX and XLDPE)
LDR
– land disposal regulation
– land disposal restrictions
– Land Disposal Restrictions of 1984
LDRD
Laboratory Director's Research and Development (ORNL)
LDRDP
Laboratory-Directed Research and Development Program (ORNL) [formerly Exploratory Studies Program (ESP)]
LDRO
low-data-rate operation
LDS
leak detection system
LDV
laser Doppler velocimeter/velocimetry
LEAF
Legal Environmental Assistance Foundation
LEAP
– Large Einsteinium Activation Program
– Large Experimental Aquifer Program
– Low-Weight Exoatmospheric Projectile Program
LECS
local economic consequences study
LED
– Laboratory emergency director
– light-emitting diode
LEED
low-energy electron diffraction
LEFM
linear elastic fracture mechanics
LEHR
Laboratory for Energy-Related Health Research
LEL
– lower explosive limit
– lower exposure limit
LEMF
laser-excited molecularfluorescence
LENS
laser-engineered net shape
LEP
– Large Electron Positron (Collider) (CERN)
– low-energy photon LEPC
LEPS
low-energy photon detectors
Leq
equivalent sound level
LER
Licensee Event Report
LERC
Laboratory Emergency Response Center (ORNL)
LeRC
Lewis Research Center (NASA at Cleveland) (now known as Glenn Research Center)
LES
– linear expenditure system
– local emergency supervisor
LET
linear energy transfer
LETC
Law Engineering Testing Company
LEU
low enriched uranium
lf
low frequency
LF
line feed
LFA
– lead federal agency
– Leader Feedback and Action
LFABB
Laboratory Facility Authorization Basis Board
LFAO
lead federal agency official
LFFTT
load-following free terminal time
LFL
lower flammability limit
LFT
Library Functional Team
LGHR
low-grade heat recovery
LGP
Laboratory Graduate Participation
LH2
liquid hydrogen
LHCD
lower hybrid current drive
LHD
Large Helical Device
LHe
liquid helium
LHH
lower hybrid heating
LHL
long half-life
LHRE
low-heat rejection engine
LI
line item
Li
lithium (element, Z = 3)
Li-MnO2
lithium-manganese dioxide
Li-SO2
lithium-sulfur dioxide
Li/FeS
lithium iron sulfide
Li2Mn2O4
lithium manganese oxide
Li3PO4
lithium orthophosphate
LIBS
laser-induced breakdown spectroscopy
LIC
liquid incinerator
LiCoO2
lithium cobalt oxide
LICS
local instrument and control subsystem
LID
laser imaging device
lidar
light detection and ranging
LIDS
Laboratory Issues Database System
LIDT
laser-induced damage threshold
LIEAP
Low-Income Energy Assistance Program (DOE)
LIF
Logistics Intelligence File (U.S. Army)
LIGO
Laser Interferometer Gravitational Wave Observatory
lim
limit (math)
lim inf
limit inferior (math)
lim sup
limit superior (math)
LIMB
limestone injection multistage burner
LIMS
Laboratory Information Management Systems
LIN
line item number
lin ft
linear foot [convert to SI: meter (m)]
linac
linear acceleration/accelerator
LiNbO3
lithium niobate
LINC
Local Information Network Connection
LION
Library System On-Line Network (replaced by OASIS)
LIP
line item project
LiPON
lithium phosphorous oxynitride
LIS
laser isotope separation
LISP
list processing
LIT
Laser Isotope Technology (program)
LITR
Low-Intensity Test Reactor
LKP
Lee-Kesler-Plöcker (model)
LL
Lesson(s) Learned
LLB
Lessons Learned Bulletin
LLC
Lessons Learned coordinator
LLCE
limited life component exchange
LLE
Laboratory for Laser Energetics (University of Rochester)
LLEA
local law enforcement agency
LLFM
low-level flux monitor
LLI
lower large intestine
LLLW
liquid low-level (radioactive) waste
LLLWC
liquid low-level waste concentrate
LLNL
Lawrence Livermore National Laboratory
LLRAG
Low-Level Radiochemical Analysis Group (ACD)
LLRW
Low-Level Radioactive Waste (Disposal Facility)
LLRWPA
Low-Level Radioactive Waste Policy Act
LLRWPAA
Low-Level Radioactive Waste Policy Amendments Act of 1985
LLW
low-level (radioactive) waste
LLW-CAT
low-level waste collection and transfer
LLWD
low-level waste disposal
LLWDD
Low-Level Waste Disposal and Demonstration Program
LLWDDD
Low-Level Waste Disposal Development and Demonstration Facility
LLWDF
– Low-Level Waste Demonstration Facility
– Low-Level Waste Disposal Facility
LLWPSS
Low-Level Waste Processing and Shipping System
lm
lumen
LM
– Laramie Projects Office (DOE)
– laser melting
– liquid metal
– logic modeling
LM-DAC
load management and distribution automation control
LMA
laboratory monitor (alpha)
LMB
laboratory monitor (beta)
LMCR
liquid-metal-cooled reactor
LMF
Laboratory Microfusion Facility
LMFBR
Liquid Metal Fast Breeder Reactor
LMR
liquid-metal reactor
LMTD
logarithmic mean temperature difference
LMTO
linear muffin-tin orbital
LMU
– LincolnMemorial University
– local multiplexing unit
ln
natural logarithm (math)
LN2
liquid nitrogen
LNG
liquefied natural gas
LOAD
low-altitude defense
LOAEL
lowest observed adverse effect level
LOB
Laboratory Operations Branch
LOC
– letter of credit
– loss of coolant
LOCA
loss-of-coolant accident
LODE
Large Optical Demonstration Experiment
LOEP
loss of electric power
LOF
loss of flow
LOFC
loss of forced convection/circulation
LOFF
loss of forced flow
LOFP
loss of flow path
LOFT
loss-of-fluid test
LOFWS
– loss of flow without scram
– loss-of-flow-without-scram (test)
Log
principal log (math)
log
common logarithm (math)
LOHS
loss of heat sink
LOI
letter of intent
LOIS
loss of interim status
LOM
Laboratory Operating Manual
long.
longitude
LOP
– Landfill Operating Permit
– loan of personnel
LOPC
loss-of-coolant pressure control
LOPO
Los Alamos (low-power) Boiling Water Reactor
LOR
low reiteration (genomic frequency sequence)
LORC
loss of reflector coolant
LORF
loss of reflector flow
LOS
– level of service
– line of sight
LOSC
loss of secondary coolant
LOTO
lock out/tag out
LOV
Loveland Area Office (DOE)
LOX
liquid oxygen
LP
– linear programming
– link processor
– liquid propellant
– loop processor
– low pressure
LPCE
liquid-phase catalytic exchange
LPD
Laboratory Protection Division (now OLP)
LPDO
Leasing Policy Development Office (DOE)
LPG
– liquid propane gas
– liquified petroleum gas
LPGS
liquid pathway generic study
LPI
– lines per inch
– low-pressure impactor
LPR
– lithium process replacement
– lithium process restoration
– load profile recorder
LPRM
local power range monitor (see APRM)
LPS
Launch Processing System
LPSI
low-pressure safety injection
LPSRA
limited probabilistic seismic risk asssessment
LPT
– low-pressure turbine
– lymphocyte proliferation test
LPZ
low-population zone
LQ
linear quadratic
LQG
linear-quadratic-Gaussian
LQG/LTR
linear-quadratic-Gaussian with loop transfer
LQR
linear-guadratic regulator
LR
– line recorder
– low range
Lr
lawrencium (element, Z = 103) (not "Lw")
LRD
Laboratory RecordsDepartment
LRM
long-reach manipulator
LRMP
location referencing message protocol
LRO
long-range order
LROP
Long-Range Operating Plan
LRP
– Landscape Research Project (DOE)
– Local Release Point
– long-range plan
LRW
liquid radioactive waste
LS
– least significant
– load specification (computer term)
– lump sum
LSA
– limited security area
– low specific activity
LSB
least-significant bit
LSC
Life Safety Code
LSCME
large-scale climate-moderating envelopes
LSCS
Large-Scale Climate Simulator (ORNL)
LSCT
Large Superconducting Coil Task
LSD
– least significant difference
– local spin density
LSDA
local spin density approximation
LSI
– large-scale integration
– listing site inspection
LSIC
large-scale integrated circuit/circuitry
LSN
long- and short-normal resistivity (geophysical logging)
LSPT
limited scope performance test
LSPTS
large-scale procurement of temperature sensors
LSS
– laboratory shift superintendent
– large-scale system
LSSC
lump-sum subcontractor
LSSS
limiting safety system settings
LSU
load survey unit
LSV
– large-scale vehicle
– low-signature vehicle LT
LTBA
likely to be available
LTC
load-tap changing
Ltd.
Limited (used with company name; comma not needed)
LTER
Long-Term Ecological Reserve (NSF)
LTF
– letter to file
– lysimeter test facility
LTH
lethality target hardening
LTHWSF
Long-Term Hazardous Waste Storage Facility
LTI
linear time invariant
LTM
– Laboratory Telerobotic Manipulator (ORNL)
– long-term monitoring
LTNIF
Low-Temperature Neutron Irradiation Facility
LTO
– landing-takeoff
– Long-Term Operations
LTR
– loop transfer recovery
– low-temperature recycling
LTRI
level and temperature recording indicator
LTS
Limited Technical Standard
LTSF
Lid Tank Shielding Facility
LTT
lymphocyte transformation test
Lu
lutetium (element, Z = 71)
LUA
lead use assembly
LUB
least upper bond (preferred over "lub" and "l.u.b.") (math)
lub
least upper bond ("LUB" is preferred) (math)
LUFT
leaking underground fuel tank
LULAC
League of United Latin American Citizens
LULU
locally undesirable land use
LUST
leaking underground storage tank
LUT
look-up table
LUTI
learn, use, train, inspect (model)
LVDT
linear variable differential transformer
LWA
Lee Wan and Associates, Inc. (now Radian Corporation)
LWC
Lost Workday Cases
LWCIR
lost-workday case incidence rate
LWD
Liquid Waste Disposal, Inc.
LWIC
lost-work injury case
LWIR
longwave infrared
LWOP
leave without pay
LWR
light-water reactor
LWSP
Liquid Waste Solidification Project
lx
lux (plural is "lux" or "luxes")