Related Clues:
- Trigram on the 7's of older phones
- Switchboard worker: Abbr
- Letters on a phone's ''0'' button
- Abbr. on a phone's '0' button
- Former telephonic trio
- Abbr. once paired with zero
- '0' button letters
- Vintage-phone trio
- Letters over 0 on older touchtones
- 7, on a rotary phone
- It's just below 0: Abbr
- Letters on old phones
- Abbr. on a zero button
- Abbr. above '0'
- Letters near zero