An octagonal prism.
stop signssome boxespicture framessome clockspickle jar tops
There are no ordinary household objects shaped like a decagon. Some glasses or vases may be decagonal in shape.
Kites, computer screens, computer keys, and wireless routers are just a few objects shaped like quadrilaterals.
There are few household objects that are shaped like nonagons. Some coins in a few countries are, but even these are rare designs.
A stop sign is shaped like an octagon.
A stop sign
An octagonal prism.
a stop sign
Some objects that are shaped like an oval include eggs and footballs.
A Stop Sign. How do you not know this?!
Scrystals and the cells in a bees honeycomb nest
stop signssome boxespicture framessome clockspickle jar tops
Oh, dude, prisms are like those fancy geometric shapes that have two parallel bases (usually in the form of polygons) connected by lateral faces. So, like, objects that are shaped like prisms could be anything from a rectangular box to a pyramid with a triangular base. Basically, if it looks like a fancy crystal or a cool building block, it's probably shaped like a prism.
eggs
A sphere.
Octagons can be irregular or regular. It depends on the measure of the angles and the length of a side. An octagon is a shape with 8 sides, not necessarily the regular octagon that stop signs are shaped like.