ive seen people use in their function parameters something like
function test(x: Number, y: Number)
what i want to know is the name of the thing used to define the parameters aka “: Number”
below is a photo of a example i used for a small script
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you mean :Frame
it’s for the coder/scripter’s reference, so it,s easier for you to code.
take this scenario where you use frame :Frame
when you call that variable and press : or . you know which function() or attribute related to that specific instance.
i am 90% sure, it doesn’t have any other impact except for code assistance.
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thank you so much for the help 
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one more thing to note is, it helps anyone who uses external modulescript (meaning from anonymous people, like something from Roblox toolbox)
Example from easyvisual module
screenshot 1
screenshot2
as you can see in screenshot 1, when I call the method :SetRotation from the modules script, the code assistance points out what data types the module parameter accepts.
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