- (acronym) . The Lyons Electronic Office Computer, an early British computer.
- (acronym) . Low Earth Orbit.
- Proper noun. (given name, male) , borne by numerous saints and 13 popes.
- Proper noun. (zodiac constellations) : A constellation of the zodiac, shaped approximately like a lion and containing the bright star Regulus.
- Proper noun. (astrology) : The zodiac sign for the Lion, ruled by the Sun and covering July 24–August 23.
- Noun. Someone with a Leo star sign.