A helmet worn by astronauts to protect from the vacuum of outer space.

Any of the family Cassidae of large sea snails.

plural of helmet snail

plural of helmet shell

Synonym of helmet snail

A gastropod mollusc, Cassis cornuta

plural of flying helmet

A leather head covering with earflaps used by early aviators.

A balaclava (type of headgear).

A mining helmet, a hard hat worn by miners that usually carries a light on the front. / Eggcorn of pith helmet.