From my limited experience, it refers to the act of reverse engendering the function (signatures) contained the code of a binary.
A binary, like the underlying code, has commonly used code split into functions that may get called in multiple places. These calls can be analyzed either through static analyzers or by a human, who may analyze context of the callsite to guess what each Arg is supposed to do/be.
For modding, e. G. in a single player game, one might want to find out where the engine adjusts the health points of a player or updates progress.
A binary, like the underlying code, has commonly used code split into functions that may get called in multiple places. These calls can be analyzed either through static analyzers or by a human, who may analyze context of the callsite to guess what each Arg is supposed to do/be.
For modding, e. G. in a single player game, one might want to find out where the engine adjusts the health points of a player or updates progress.