Related Clues:

• Ltr.-routing word
• Business-envelope abbreviation
• Ltr. directive
• Abbr. before a colon
• Routing letters
• Memo abbreviation
• Abbr. on a memo
• Abbr. on a business envelope, perhaps
• Bus.-letter letters
• Abbr. on envelopes
• Abbr. before the name of a memo recipient
• Bus. envelope abbr.
• Business envelope abbr.
• Pass along, as an e-mail: Abbr.
• Ltr. routing aid