What does IG stand for?

Al-Gama at al-Islamiyya - Militant group - Egypt (EMA)

Alisarda - ICAO designator (AD)

ALISARDA SpA - Italy - ICAO designator (ICDA)

Galesburg Public Library, Galesburg, IL - Library symbol - Library of Congress (LCLS)

IGI, Inc. - AMEX symbol (SPSG)

Igloo - Spacelab Pallet Missions

Ignition - Automotive engineering

Ignitor - Electron device (MSA)

Illawarra Greens - Political party - Australia

Illustrators Guild - Later, GA (EA)

Image Generator (MCD)

Immature Granule (DMAA)

Immune Globulin

Immunology - Medical specialty (DHSM)

Imperial Gallon

Impulse Generator (IAA)

Index of Gravity - Engineering

Indiana Geologists (IDEM)

Indicating (SAUS)

Indicator Group (MCD)

Indice glicemico - Glycemic Index

Indignant - Telegraphy (PCTE)

Indo-Germanic - Language, etc.

Induction Generator (SAUS)

Inductor Generator (SAUS)

Industrial Grade

Industrial Group (SAUO)

Industriegewerkschaft - Industrial Trade Union - Germany

Industry Group (HEAS)

Inertial Guidance

Inertial Gyroscope

Infantile Glaucoma (MELL)

Inflammatory Glaucoma (MELL)

Information Group (SAUO)

Ingot (DNAB)

In-Ground (ADA)

Inner Gimbal

Inner Guard - Freemasonry

Input Gate (SAUS)

Input Generator (ACAE)

Inscriptiones Graecae - Epigraphic notation

Inside Guardian - Freemasonry (ROG)

Inspection Gauge (MCD)

Inspector General - Air Force, Army, Marine Corps

Instantaneous Grid (IAA)

Institute of Genetics - Canadian Institutes of Health Research - Canada (RCD)

Institute of Geography (SAUO)

Institute of Geophysics - Later, IGPP - University of California (MCD)

Institute of Geotechnology - University of Tennessee, Knoxville (RCD)

Institute of Groundsmanship (EA)

Institution of Geologists (EAIO)

Instruction - or Instructor Guide

Instructor in Gunnery - Military - British

Instructor of Gunnery (SAUO)

Instructors Guide (SAUS)

Instrumentation Group

Instrument Ground (NASA)

Instytut Geologiczny (GIS)

Insulated Gate (DEN)

Insulin and Glucose - Medicine (DMAA)

Integrated Genetics

Intelligence Generator

IntelliGenetics (HGEN)

Intendant-General

Interagency Group - Federal government

Interblock Gap (SAUS)

Interconnect Group (CAAL)

Interdepartmental Group - DoD

Interest Group

Interframe Gap - Communications term (DCT)

Inter-Gas System

Inter-Governmental (SAUO)

Intergranular - Metallurgy

Internal Guidance (NASA)

Internationale Kunstgilde - International Art Guild - IAG (EAIO)

International Gateway - Disney (DIS)

International Gateway (SAUS)

International General (EA)

International Graphics - Formerly, IGI (EA)

International Guides' Club (EAIO)

Intestinal Gas (MELL)

Intestinal Groove

Intonation Group - Linguistics (IEL)

Intragastric

Inverse Gain (NVT)

Inverse Gate (SAUS)

Inverse Gaussian - Statistics

Investigative Operations (SAUS)

Investment Grant - British

Involute Gear (SAUS)

Ion Gun (SAUS)

Ionization Gauge (SAUS)

Iris Guide (PDAA)

Irish Guards - Military unit

Iron Guard (SAUO)

Irritable Gut - Medicine (DMAA)

Irvine Group - An association (EA)

Islamic Group - Government term (GA)

Isotope Geology (SAUS)

Izmenyaemaya Geometriya - Variable Geometry - Suffix letters on Soviet combat aircraft

igneous (SAUS)

Intragastrically - Medicine (DB)

Immunoglobulin - Immunology