Also known as: 対魔術式駆動鎧, アンチアートアタッチメント, Tai_Majutsu-shiki_Kudō_Yoroi, Anchi_Āto_Atatchimento, A.A.A., AAA
Power Suit from the ToAru Majutsu No Index series.
The Anti-Art Attachment (lit. "Anti-Magic-Type Powered Suit"), A.A.A. for short, is a Powered Suit (ToAru) developed in Academy City and used by Kihara Noukan. As the name suggests, it is for use against Magic, though despite that, the suit has a connection with magic, specifically that of Aleister Crowley (Toaru Majutsu No Index). Also commonly used by Misaka Mikoto.
External links
https://toarumajutsunoindex.fandom.com/wiki/Anti-Art_Attachment