Related Clues:

• Envelope insert (Abbr.)
• Routing notation
• Ltr. insertion
• Envelope-routing abbreviation
• Abbr. at the bottom of an application
• Subject line abbr
• Address label abbr
• "To" on a memo
• Mail routing letters
• Letter insert: Abbr
• Ltr. addition
• Cover letter abbr
• Abbr. before a colon and a name
• Name preceder on some envs
• Bus. letter accompanier