A broad piece of defensive armor used for protection in war, as well as anything that protects or defends.

A shape resembling an inverted triangle with curved sides, commonly used for police identifications and company logos, as well as in heraldry, transportation, and law enforcement.

(geology) A wide and relatively low-profiled volcano, usually composed entirely of lava flows.

(automotive, British) Parts at the front and back of a vehicle which are meant to absorb the impact of a collision

(transitive, intransitive) To protect, to defend.

(UK, intransitive) To shelter; to protect oneself.

(electricity) To protect from the influence of. (Can we add an example for this sense?)