Cable Integrity Group (NASA)
Canadian Institute of Gemmology (FOTI)
Canadian Institute of Geomatics - Association Canadienne des Sciences Geomatiques (ASC)
Cardiointegram - Medicine (RAWO)
Ceiling (DA)
Central Intelligence Group (LAIN)
Centre for Integrated Genomics - Canada (RCD)
Centre Informatique Geologique - Geological Information Centre - Canada
Chemical Ion Generator (AAG)
Chief Intendent-General - Freemasonry (ROG)
Christians in Government - An association (EA)
Cigarette
Citadel Gold Mines, Inc. - Toronto Stock Exchange symbol
Clause Interconnectivity Graph (SAUS)
Climate Impacts Group - National Oceanic and Atmospheric Administration (RCD)
Climate Interest Group (GEOI)
Cloud Ceiling Height (WEAT)
Cold Insoluble Globulin (SAUS)
Comite International de Geophysique - International Geophysical Committee
Commerce International Group Ltd. (SAUO)
Commonwealth Industrial Gases - A former industrial gas company (CDIAC)
Communications and Interface Group - NASA (NASA)
Communications Industries Group (SAUO)
Community Involvement Group
Compliance and Investigations Group - U.S. Office of Personnel Management (BARN)
Composite Engineering, Concord, MA - Manufacturer code for watercraft hull identification number (USCG)
Compound Interlace Grating
Computer Image Generator - or Generation (MCD)
Computer-Informationsdienst Graz - Graz Computer-Information Service - Austria (IID)
Computer Investment Group, Inc. (NITA)
Computer Investors Group, Inc. (SAUO)
Computerized Interactive Graphics (MCD)
Conference Internationale du Goudron - International Tar Conference - ITC (EAIO)
Connector Integration Group
Connector Integrity Group
Consolidated Cigar Holdings, Inc. - NYSE symbol (SAG)
Continental Graphics Corp. - AMEX symbol (COMM)
Contractor Interface Guide
Coordinate Indexing Group - ASLIB (DIT)
Counterintelligence Group - Military
Creative Industries Group, Inc. - Auburn Hills, MI (TSSD)
Cryogenic In-Ground (OA)
Current Intelligence, Group (NATG)
International Geophysics Committee (SAUS)