TITLE: What Are $4$ Sided Shapes Called Again?
QUESTION [7 upvotes]: I apologise for the really basic question. This didn't really fit on any other StackExchange website so the Maths one was the closest one where I could ask.
Really Basic Question- What are $4$ sided shapes called again? 
Like how triangles are $3$ sided shapes, octagons are $8$ sided shapes, ... What are the $4$ sided ones called then?

REPLY [4 votes]: Shorter version is "quadrangle".