00
- 0 (disambiguation)
- 00 Agent
- 00 gauge
- 00s (disambiguation)
- 0O (disambiguation)
- 1900
- 2000
- 2100
- American wire gauge
- Double O (disambiguation)
- Double Zero Records
- Double Zeros (Runaways)
- International direct dialing
- Leading zero
- Mobile Suit Gundam 00
- O0 (disambiguation)
- OO (disambiguation)
- Size 00
- Symphony No. 00 (Bruckner)
- Zero Zero (disambiguation)