(.2.).International.Standard.Atmosphere
ISC  Integrated.Systems.Controller
ISDN  Integrated.Services.Digital.Network
ISDOS  Information System Design and Optimization
System
ISDS  In-Service.Data.System
ISH  Intermediate.System.Hello
ISLN  Isolation
ISO  ( 1 ) International Organization for
Standardization.
( 2 ) International Standards Organization . (.3.).Isolation
Iso-Contour Refer.to.contour ISOPA ISO Protocol Architecture

ISQC  Intersound.Quality.Control.facility..Facility.that. checks,.labels.and.distributes.all.video.cassettes.
ISP  (.1.).Integrated.Switching.Panel. (.2.).Internet.Service.Provider
ISR  Interrupt.Service.Routine
ISS  (.1.).Impending.Stall.Speed.. (.2.).Integrated.Surveillance.System
ISSN  Intermediate.System.Subnetwork
ISSPU  Integrated.Surveillance.System.Processor.Unit
ISU  Initial.Signal.Unit
ITA  Institute.of.Air.Transport
ITM  Information.Technology.Management.is.the. ground.based.portion.of.an.ADMS.(See.also. EDMS.).
ITO  Indium-Tin Oxide
ITS  Integrated.Test.System
ITSE  Integrated.Test.and.Support.Environment
ITT  (.1.).Interstage.Turbine.Temperature.
(.2.).Inter-Turbine.Temperature
ITU  International.Telecommunications.Union
IUPS  Internal.Uninterruptible.Power.Supply
IV  Isolation.Valve
IVI  Interchangeable.Virtual.Instrumentation
IVSI  Instantaneous.Vertical.Speed.Indicator
ITWS  Integrated.Terminal.Weather.System
JAA  Joint.Aviation.Authority
JAR  Joint Airworthiness Requirement
JAR-AWO  Joint Airworthiness Requirements–All Weather
Operations
JAO  Jet.Assisted.Takeoff
JCDP  Joint Conceptual Definition Phase
JDCP  Joint.Development.Concept.Phase
JDP  Joint Definition Phase

JFET  Junction.Field.Effect.Transistor 
JPEG  Joint.Photographic.Experts.Group 
JPS  Journal.Processing.System 
J/S  Jammer.to.Signal.Ratio 
JSAT  Joint.System.Acceptance.Test 
JTAG  Joint.Test.Action.Group 
JTIDS  Joint.Tactical.Information.Distribution.System 
KB  Kilo-Bytes.(thousand.bytes) 
KBITS  Kilobits 
Kbps  Kilobits.per.second 
kb/s  Kilobits.Per.Second 
KBU  Keyboard.Unit 
Key  A.hand-operated.switching.device.or.the.act.of. 
operating.such.a.device. 
KG  Kilogram 
kHz  Kilohertz.(1000.cycles.per.second) 
km  Kilometer 
KPI  Key.Performance.Indicators 
KPS  Kilobytes.Per.Second