- Perseus - (Greek mythology) the son of Zeus who slew Medusa (with the help of Athena and Hermes) and rescued Andromeda from a sea monster
--1 is a kind of mythical being
- Perseus - a conspicuous constellation in the northern hemisphere; between Auriga and Cassiopeia and crossed by the Milky Way
--2 is a kind of constellation
--2 has member: Algol - Perseus - a conspicuous constellation in the northern hemisphere; between Auriga and Cassiopeia and crossed by the Milky Way