A marine mollusc, of the family Nautilidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers. / A nautilus, Nautilus pompilius.

(historical) A 5.9-inch artillery shell of the kind used by Germany in World War I.

(informal) Clipping of Vietnam. / (informal, historical) The Vietnam War.

(idiomatic) A local neighbourhood or region. / (idiomatic) A place or field in which one is comfortable or with which one is familiar.

(literally) Having a stiff neck; suffering from torticollis / (figuratively) Stubborn and arrogant.

(simile, colloquial) Stark naked; nude; especially, naked in a public setting and without embarrassment.

(litotes) Reasonably good.

Any of the code names used by NATO to identify Soviet and Chinese military equipment

A better, often utopian (future) world. / A terrible, often oppressive or dystopian world.

(business, espionage, military) A name used to clandestinely identify somebody or something, either for military or espionage purposes, or for commercial confidentiality.