What are the pieces of code called that prevent multiple inputs due to lag?

I remember reading about these on developer.roblox.com, it was a sample of code that you could place into, for example, a clickdetector-type function. It would make it so that when a player clicked to update a value, it would make sure that only one input would be registered in case the player/server was experiencing lag. What are these called? I couldn't seem to re-find the article about them anywhere. Thanks in advance.