- The mottled, horny, translucent, brownish covering of the carapace of certain tortoises or turtles, especially the hawksbill, used to make combs, jewelry, and other articles.
- A synthetic imitation of natural tortoiseshell.
- See hawksbill.
- A domestic cat having fur with brown, black, and yellowish markings.
- Any of several butterflies, chiefly of the genus Nymphalis, having wings with orange, black, and brown markings.