and similar can mean:
- Letter (alphabet), a grapheme, part of an alphabet, abjad, abugida, or syllabary
- Letter (message), correspondence, a written message
- Letter (paper size), the letter-size paper
- "Letters" can also mean literature, as in "arts and letters"
- Letterman, recipient of an award ("letter") given to an interscholastic and/or intercollegiate student of merit in a sport, choir or band (also see varsity letter)
Gay Sex., a novel by John Barth