Ar, ef or dee: Abbr.

• Quaint communication: Abbr
• USPS delivery that's rarely handwritten
• Env. enclosure
• Number alternative on a lic. plate
• Copier paper setting: Abbr
• Personal ad abbr
• Env. filler
• Env. contents
• Size for a printer: Abbr

Wikipedia Word definitions in Wikipedia
LTR or ltr may refer to: