GC

Initialism of gas chromatography.

(anatomy) Initialism of germinal center.

(UK) Initialism of George Cross: a medal presented to civilians and military personnel of the United Kingdom for actions which are not in the face of the enemy.

(cycling) Initialism of general classification.

(Australia, film classification, dated) Initialism of general classification.

Initialism of garbage collection.

Initialism of garbage collector.

Initialism of good condition.

(biochemistry) Initialism of glucocorticoid.

(biochemistry) Initialism of guanylate cyclase.

(genetics, molecular biology) Initialism of guanine-cytosine.

(text messaging) Initialism of group chat.

(video games) Nintendo GameCube

(informal) Initialism of gender critical.