In mathematics, GCD is short for greatest common divisor.
In navigation, GCD is the great circle distance.
Griffith College Dublin[?] is known as GCD for short.
GCD is also the Grand Comic Book Database[?], at http://www.comics.org.
The Global Clan Directory[?] (GCD), at http://www.globalclandirectory.com/) is a website listing gaming clans[?] organized around multi-player video games.
Global Communications Devices[?] (GCD) is a fabless[?] supplier of highly integrated semiconductor devices used in wireless networking, http://www.gcdchips.com.
Gardner Carton & Douglas[?] (GCD) is a law firm[?] with offices in Chicago and Washington DC, http://www.gcd.com.
