a toothed wheel round or polygonal shape teeth are angled to allow for interlocking with other cogs often made of metal or plastic may have a hole in the center may have an axle attached to it
cog which is a toothed wheel cog which has round or polygonal shape cog which has teeth are angled to allow for interlocking with other cogs cog which often made of metal or plastic cog which may have a hole in the center cog which may have an axle attached to it