- (zoology) Having ten legs.
- (zoology) Any crustacean, of the order Decapoda, such as crabs or lobsters.
- (zoology) Any of various animals having ten legs or similar appendages, especially mollusks such as squid and cuttlefish.
- (rail transport) A nickname for either the 0-10-0 or 2-10-0 train configurations. Sometimes capitalized.