Tuple
A tuple is an ordered list of elements.
In Roblox Lua, the Tuple type refers to a list of Lua variables. If a method accepts a Tuple as an argument, then that means it accepts multiple values. If a method returns a Tuple, then that means it returns multiple values.
As an example, the FindPartOnRay returns a Tuple. More specifically, it returns a Part and a Vector3.
local part, position = Workspace:FindPartOnRay(ray)
The Invoke method in BindableFunction accepts a Tuple as an argument. So, it can accept multiple arguments.
BindableFunction:Invoke(1, true, "string", Vector3.new(0,0,0) )