An octagon is an 8 sided figure and looks like a STOP sign.

An octagon is a closed shape with eight sides and the lengths aren't always equal so it doesn't always look like a stop sign This is called an irregular octagon

A stop sign

An octagon is a 8 sided polygon that is also an equilateral figure which means all sides are the same length unless it is an irregular octagon

Eight sides

Dose an octagon look like a house