Related Clues:
- Mailing label abbr.
- Business-letter abbr.
- Start of a chat room afterthought
- Letters on a memo
- Business-letter letters
- Directive on an env.
- Bit of chat room shorthand
- 'Incidentally,' on IM
- Letters on some letters
- Ltr. letters
- Ltr. recipient pinpointer
- Env. routing indicator
- Abbr. before a name on an envelope
- Letters directing letters
- Envelope letters