anti-art attachment
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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. Also commonly used by Misaka Mikoto.
External links
https://toarumajutsunoindex.fandom.com/wiki/Anti-Art_Attachment