Related Clues:
- Routing letters
- Memo abbreviation
- Web site starter
- Abbr. on a memo
- Abbr. on a business envelope, perhaps
- Bus.-letter letters
- Web letters
- Abbr. on envelopes
- Abbr. before the name of a memo recipient
- Bus. envelope abbr.
- Business envelope abbr.
- Ltr. routing aid
- URL beginning
- Corp. memo directive
- Beginning of a Web address