A yellow rattle, Rhinanthus minor (flowering plant native to Eurasia)
The fleshy red crest of a rooster
An annual garden plant (Celosia argentea var. cristata, syn. Celosia cristata), having showy red clusters of flowers
A serrated cleat once fitted to the yards of a square-rigged ship and used when the sail was being reefed
A red cap once worn by court jesters