Related Clues:

• Business-letter letters
• Directive on an env.
• Letter add-on (Abbr.)
• Letters on some letters
• Ltr. letters
• Ltr. recipient pinpointer
• Env. routing indicator
• Abbr. before a name on an envelope
• Letters directing letters
• Envelope letters
• Like an SASE, often
• Abbr. indicating to whom it may concern
• Ltr.-routing aid
• Letters that help a letter sorter
• “To” on a fax