0-0

See also: 00 and Appendix:Variations of "oo"

Translingual

Alternative forms

• O-O

Symbol

0-0

1. (chess) kingside castling
   • 2022, “2023 Laws of Chess”, in FIDE‎^[1] (in English), archived from the original on 16 March 2025, page 23:

     1.e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4 d5 6. exd6 e.p. Nxd6 7. Bg5 Nc6 8. Qe3+ Be7 9. Nbd2 0-0 10. 0-0-0 Re8 11. Kb1 (=)

See also

• 0-0-0
• Wikipedia article on algebraic chess notation

English

Adjective

0-0 (not comparable)

1. (aviation) zero-zero, a term meaning no ceiling and no visibility