Bk. introduction

• Email subject abbr
• Dr. J., e.g
• N.B.A. position: Abbr.
• Opposite of rev
• E-mail heading: Abbr
• Abbr. on some emails
• Subject line starter on many an e-mail joke
• Pass along, as an e-mail: Abbr
• Start of many a chain email

Wiktionary Word definitions in Wiktionary
abbr. forward