AA

AA was Sheldon's original suggestion for The Physics Bowl Quiz Team because "gram for gram, no animal exceeds the relative fighting strength of the army ant." Raj argues that  you can’t incinerate a Bengal Tiger with a magnifying glass.

Army Ants

Sheldon designs the Team Shirts in Star Trek colours before he is kicked out of the team. Leonard is worried people might think it means "something else to certain people" His opponent team was  PMS.

Alternative Extensions

Anodised A luminium.

Alcoholics Anonymous.

Anti-Aircraft.

Automobile Association.

Amino Acids.

African-American.