What does char or plr mean? is there a specific parameter for different functions?
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Parameter for function question?
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Yes.
I'd assume, from the wording of your question, that you're asking this regarding the ROBLOX wiki. I'll give you an example of how this works.
game.Players:GetPlayerFromCharacter(character)
This is a simple function to use a player's character to get a player object. The "character" variable is what we use to find this player.
For example,
local char = workspace.SystemUnderflow
local plr = game.Players:GetPlayerFromCharacter(char)
The name "char" or "plr" is just shorthand for "character" and "player".
When you give the function a variable that is not correct, then it will either error or return nil. So if you try to use a Player object instead of a character model, it'll return nil.
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One, question, is there a list of working parameters somewhere?