dragon's teeth

Used other than figuratively or idiomatically: see dragon, tooth.

(military) Square-pyramidal fortifications of reinforced concrete to impede the movement of tanks and mechanised infantry.

(UK, Australia, New Zealand, road transport) A series of triangular road surface markings painted on each side of a traffic lane, used for traffic calming or to alert drivers to a speed limit.

Lotus maritimus, a plant in the legume family.