Constructors
From Legacy Roblox Wiki
Introduction
Constructors are functions which create an instance of data or a value of a specific type. While some functions may return a specific data type, for instance, a Vector3, they are not considered a Constructor because they needed to call a constructor to make the value.
function a(x,y) return Vector3.new(x.x,y.y,0) --A constructor is called here. end
Examples
Vector3.new(x,y,z) Instance.new(n) CFrame.Angles(a,b,c)