001, O01, or OO1 may refer to:

Arts and entertainment

*001, fictional British agent, see 00 Agent *''001'', also known as the ''Princess of Klaxosaurs'', is a character and the central antagonist from ''DARLING in the FRANXX'' *Player number of both Oh Il-nam and Oh Young-il, characters from the South Korean survival drama '' Squid Game'' ** "001" (''Squid Game'' episode), 2024 episode of ''Squid Game''

Transportation

*AM-RB 001, the code-name for the Aston Martin Valkyrie sports car * Zeekr 001, an electric shooting brake produced by Geely

Science

Asteroids

*1992 OO1, the asteroid 10111 Fresnel *1997 OO1, the asteroid 9987 Peano

Alleles

*''O01'', an allele, see ABO

Locations

*O01 Heussler Hamburg Heliport, see list of airports in New York *001, the code for the World in the UN M49 standard for area codes

Other uses

1 (number) 1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers. This fundamental property has led to its unique uses in other fields, ranging from science to ...

, a number, a numeral *001, former emergency telephone number for the Norwegian fire brigade (until 1986) {{numberdis