Enter a clue or pattern or both:
The Clue
Volume purchase?: Abbr. (3 letter answer)
The Answer
ENC
Tags
Notes
The answer ENC is seen frequently, appearing about once every 140 puzzles.
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Collier's, for one: Abbr.
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Envelope abbr.
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Ltr. accompanier
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S.A.S.E., e.g.
Abbr. at the bottom of a letter
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Bottom-of-letter abbr.
Bus.-letter abbr.
Bus.-ltr. abbr.
Business letter abbr.
Business-letter abbr.
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Cover-letter letters
Direct mail abbr.
Letter accompanier: Abbr.
Something inside: Abbr.