Related Clues:
- Like many cks
- Subject line abbr
- Address label abbr
- "To" on a memo
- Mail routing letters
- Abbr. before a colon and a name
- Name preceder on some envs
- Letters on an envelope addressed to a company
- SASE, say
- Letters facilitating sorting
- Acct. statement, at times
- Extra item in an envelope: Abbr
- Letter heading abbr
- Memo heading abbr
- Abbr. often capitalized on envelopes