- Used to indicate a size that is smaller or larger than 00
- The precision screwdriver set includes size 0, 00, and 000 Phillips head.
- 0000 is meant for newborns but if your baby is not too small at birth, you can start with size 000 singlets.
- 000 capsules are too large to swallow, but are used for medication to be mixed with a liquid.
- In Australia, the phone number for contacting emergency services.
- Usually said as "triple O", using the letter 'O' rather than 'zero'.