Since 1998, the Casia Corporation Holland have been working on The Definitive TLA Wörterbuch to help people find their way in the ever growing intellectual chaos caused by the late-twentieth century tendency to use as many acronyms in daily communication as possible. Especially acronyms with a length of three letters have been and continue to be immensly popular, not only in Information and Communication Technology circles, but also among people in more mundane fields of labour; a tendency that has mushroomed with the advent of mobile communication and the combined growing popularity of Short Message Services.

At present, there are 7414 TLAs in the database. Of these, 4445 are distinct, out of 17576 possible (25.29%).

Please click on a bar in the diagram that is displayed below, or enter a search-string.

I
IAA		Immigration Appellate Authority
IAC		International Academic Contacts
IAD		International Air Distress
		Intimate Area Dryness
IAG		iPhone Application Graveyard
IAK		Industrieel Assurantie Kantoor
		Initiatief Audiovisuele Kunsten
		Institut für Angewandte Kreativität
IAM		Identity and Access Management
IAP		Innovatief Actie Programma
		Internet Assembled Philosophy
IAS		Indicated Airspeed
		Institute of Advanced Studies
		International Association of Scientologists
IAU		Ice Age Unit
IAV		Instituto de Áudio & Vídeo
IBA		Idiote Belgen Altijd
IBB		Ina Boudier Bakker-laan
IBC		International Broadcasting Convention
IBD		International Blasphemy Day
IBG		Informatie Beheer Groep
IBL		Image Based Lighting
IBM		International Bullshit Machines
IBS		Institute for Brewing Studies
IBU		International Bittering Unit
ICA		Indene Carboxylic Acid
ICB		Ian Curtis Buried
ICC		International Cricket Council
		International Criminal Court
		Islay Cask Company
ICF		Inertial Confinement Fusion
ICI		Italiaans Cultureel Instituut
ICL		IntraCommunautaire Levering
ICM		Image Color Matching
		International Congress of Mathematicians
ICN		Intergalactic Computer Network
ICP		IntraCommunautaire Prestaties
ICR		in-circuit replica
		Institute for Creation Research
ICS		Information and Computer Science
		Inleiding ComputerSystemen
		International Card Services
		International Classification for Standards
ICT		Informatie- en Communicatietechnologie
ICV		IntraCommunautaire Verwerving
IDA		International Dispensary Association
IDC		Intelligent Design Creationism
IDD		I Don't Disagree
		Ideal De-Correlating Detector
		Indeed
		Inderdaad
		Information Data Display
		Information Delivery Device
		Infratools Desktop Discovery
		Insulin Dependant Diabetes
		Intentional Deficit Disorder
		Interdirector Designation
		Interface Definition Document
		Interface Description Document
		Interface Design Description
		Interface Design Document
		Interface Designation Drawing
		Interim Dry-Docking
		Intermediate Design Document
		Internal Disc Decompression
		International Direct Dialing
		Internet Data Distribution
		Interpacket Delay Difference
		Intervertebral Disc Degeneration
		Intervertebral Disc Disease
		Invatamint Deschis la Distanta
		Iodine Deficiency Disorders
IDE		Integrated Development Environment
		Integrated Drive Electronics
IDF		Inverse Document Frequency
		Israel Defense Forces
IDG		International Data Group
IDL		Instituut Defensie Leergangen
		Interface Definition Language
IDM		Intelligent Dance Music
IDP		IsoDecyl Pelargonate
IDS		Internationaal Diploma-Supplement
IDU		Interchangable Dude Unit
IEA		International Energy Agency
IED		Improvised Explosive Device
		Innovative Electronic Designs
		Istituto Europeo di Design
IFA		International Funk Aggression
IFD		Internet Freedom Day
IFE		Institutt For Energiteknikk
IFF		Interchange File Format
IFR		Instrument Flight Rules
		Instrument Flight Rules
IFS		Institute for Fiscal Studies
		Iterated Function Systems
IFV		Infantry Fighting Vehicle
IGG		Instituut voor de Geschiedenis en Grondslagen (van de Wiskunde en Natuurwetenschappen)
		Insuline Gelijkende Groeifactor
IGJ		Inspectie Gezondheidszorg en Jeugd
IGM		Instant Gratification Monkey
IGP		I Gotta Pee
		Interior Gataway Protocol
IHA		In Het Algemeen
IHB		In het bijzonder
IHC		Institute for Human Continuity
IHD		Ik Haat Drukkers
IHE		Italian Heraldic Encyclopedia
IHG		Ik Haat Gebruikers
IHI		Institute of Health care Improvement
IHM		Ik Haat Mensen
		Internet Hate Machine
IHP		Integrated Haskell Platform
IHR		Institute for Historical Review (cunts)
IID		Infinite Improbability Drive
IIE		International Industrial Entrepreneurship
IIG		Independent Investigations Group
		In Ieder Geval
III		Instantly Implemented Imagination
		Internet Indirection Infrastructure
IIO		Intermediair Imago Onderzoek
IIP		Iedereen Is (een) Prutser
IIR		Institute for Internation Research
IIS		Iedereen Is Saai
		Internet Information Server
IIT		Iedereen Is Traag
IKC		Integraal Kindcentrum
IKD		Informatie- en Kenniscentrum Diervoedersector
IKT		Indringend Keten Testen
ILC		International Latex Corporation
		International Linear Collider
ILM		Indie Label Market
		Industrial Light & Magic
ILO		Integrated Light-Out
		International Labour Organization
ILP		Important Looking Pirates
ILS		Immediate Life Support
		Instrument Landing System
		Instrument Landing Systems
ILT		Inspectie Leefomgeving en Transport
ILW		Intermediate Level Waste
IMA		Informatiecentrum Militaire Aangelegenheden
IMC		Instrument Meteorological Conditions
		Internal Market Comissioner
		Internet Mail Consortium
IMD		Iedereen Moet Dood
		In My Dreams
		Internationale Mannen Dag
		Invaders Must Die
IMF		International Monetary Fund
IMG		Instituut Mijnbouwschade Groningen
IMO		In My Opinion
		International Mahler Orchestra
IMP		Interface Message Processor
		Internet Messaging Program
IMS		Inertial Measurement System
		Information Management System
		iTunes Music Store
IMT		International Military Tribunal
IMU		Inertial Measurement Unit
INC		Incorporated
		Iraqi National Congres
IND		Immigratie en Naturalisatie Dienst
INF		INFinite
ING		Internationale Nederlanden Groep
INK		Instituut Nederlandse Kwaliteit
INL		Idaho National Laboratory
INO		In Name Only
INS		Integrated Network System
INT		Intelligence
IOC		Index Of Coincidence
		International Olympic Committee
IOD		Instruments Of Darkness
IOI		Interuniversitair Oogheelkundig Instituut
ION		Intervakgroep Onderwijs Natuurkunde
IOP		Input/Output Package
IOR		Index Of Refraction
IOS		Information Overload Syndrome
IOT		Internet Of Things
IOU		I owe you
IOW		In Other Words
IPA		India Pale Ale
		Inductive Plasma Accelerator
		International Phonetic Alphabet
		International Police Association
IPB		Insanity Prawn Boy
IPC		InterProcess Communication
IPG		Image Plane Group
IPL		Initial Program Loader
IPM		Inter Process Messaging
IPO		impersonating a Police Officer
		Initial Public Offering
		Interprovinciaal Overleg
IPP		Imprisonment for Public Protection
		Instituut voor Publiek en Politiek
		Internet Printing Protocol
IPR		Intellectual Property Rights
		Interactive Photorealistic Rendering
IPS		Indoor Positioning System
		Insight Performance and Software
		International patching system
		Internet Protocol Suite
IPU		Invisble Pink Unicorn
IPV		In Plaats Van
IPX		Internetwork Packet Exchange
IRA		Indian Removal Act
		Internet Research Agency
		Irish Republican Army
IRC		Internet Relay Chat
IRI		Istituto per la Ricostruzione Industriale
IRK		Internationale Reis- en Kredietbrief
IRL		In Real Life
IRP		I/O Request Package
IRQ		Interrupt ReQuest
IRR		Internet Routing Registry
IRS		Inland Revenue Service
		Internal Revenue Service
IRV		Immediate Response Vehicle
ISA		Individual Savings Account
		Individueel StudieAdvies
		Industry Standard Architecture
		Instruction Set Architecture
		Inteligente Snelheids Aanpassing
		Intelligent Speed Assist
		International School Almere
		International Seabed Authority
		International Standard Atmosphere
		Internet Security & Acceleration
ISC		Informatie Systeem Configuratie
ISD		Inrichting voor Stelselmatige Daders
ISE		Interactive Software Engineering
ISF		Information Systems Foundations
ISG		Internet Services Group
		Islamitische Scholengemeenschap
ISH		Information Superhighway
ISI		Import Substitutie Industrialisering
		Information Science Institute
		Islamic State of Iraq
ISL		In Situ Leaching
		Initial System Loader
		Inverse Square Law
ISM		Incredible Shrinking Mesh
ISO		International Standards Organisation
		International Student Office
		Interstedelijk Studenten Overleg
ISP		In-System Programmer
		Internet Service Provider
		Interrupt Stack Pointer
		Specific impulse
ISR		Intelligence, Surveillance, and Reconnaissance
ISS		Institutional Shareholder Services
		International Space Station
ISU		International System of Units
ISV		Independent Software Vendor
ISW		Institute for the Study of War
ITA		Internationaal Theater Amsterdam
ITB		International Talent Booking
ITC		Independent Television Commission
		Interdenominational Theological Center
		International Test Conference
		International Trade Center
		International Trade Commission
		International Typeface Corporation
ITF		In The Flesh
		Instituut Theoretische Fysica
ITL		Inzet- en Takenlijst
ITN		In The Nursery
ITP		Institute for Theoretical Physics
		Intelligent Tracking Prevention
ITS		Inertia Tensor Scale
		Information and Technology Services
ITT		Individual Time Trial
ITU		International Telecommunication Union
		International Telecommunications Union
ITV		Independent Television
IUP		Initial Upper Paleolithic
IUS		Interpretive Unplanned Skywriting
IVA		Inkomensvoorziening Volledig Arbeidsongeschikten
IVB		Impuls Vanuit de Buitenwereld
IVE		Inspectie Verkeer En Waterstaat
IVF		In Vitro Fertilisatie
IVM		In Verband Met
IVN		Instituut voor natuureducatie en duurzaamheid
		Internationale Vereniging voor Neerlandistiek
IVR		Influenza Virus Resource
		Interactive Voice Response
IWC		Internationale Walvisvaart Commissie
IWD		Islamic World Dominance
IWF		Intelligent WebFormulier
IWM		Imperial War Museum
IWS		Ik Wil Slapen
IXC		Islam eXperience Centre
IYF		In Your Face
IZR		Instante zelfreflectie