Limbus Company is the turn-based RPG from South Korean studio Project Moon, released in 2023, in which players guide a group of Sinners through the dystopian City. The Index is one of the City's shadowy factions, known for issuing prescripts, written instructions its followers are compelled to obey. A short cue marking one of those deliveries has become a recognisable shorthand for the faction itself, circulating on fan soundboards and in short-form edits where a sudden, non-negotiable order is the joke. Its brevity keeps it easy to reuse.