One of the most recognizable parts of a chicken is its comb. Most people know that the comb is the (usually) red fleshy part at the top of a chicken’s head. Not all combs are the same, though. The American Poultry Association lists 9 different types of combs in their American Standard of Perfection.
The single comb is probably the most recognizable, in part thanks to Foghorn Leghorn. It is, as the name implies, a single formation, with multiple points. It should be fairly thin & begin at the beak. This comb should be larger on males than females. A large, bright comb may attract a potential mate. On females, if it gets too large it may flop over.
Many breeds have a single comb including:
Rhode Island Red