Letter
Letter, letters, or literature may refer to:

Characters typeface
Letter (alphabet), a character representing one or more of the sounds used in speech; any of the symbols of an alphabet.
Letterform, the graphic form of a letter of the alphabet, either as written or in a particular type font.
Rehearsal letter in an orchestral score

Communication
Letter (message), a form of written communication
Mail
Letters, the collected correspondence of a writer or historically significant person
Maktubat (disambiguation), the Arabic word for collected letters
Pauline epistles, addressed by St. Paul to various communities or congregations, such as "Letters to the Galatians" or "Letters to the Corinthians", and part of the canonical books of the Bible
The letter as a form of second-person literature; see Epistle
Epistulae (Pliny)
Epistolary novel, a long-form fiction composed of letters (epistles)
Open letter, a public letter as distinguished from private correspondence
Letter to the editor, a letter sent to a newspaper, magazine, or online publication by one of its readers and meant to be published
Encyclical letter in the Catholic Church
Letter (paper size), paper conventionally sized for letter-writing

Education
Letters, an obsolete synecdoche for literacy; e.g. "He knows his letters"
Literature as in Letters, Arts and Sciences
Varsity letter, an award given in the U.S. for interscholastic or intercollegiate merit in a sport or other activity such as band or orchestra

Music
Letters (Butch Walker album), 2004
Letters (Jimmy Webb album), 1972
Letters (Matt Cardle album), 2011
Letters (Bish album), 2020
"Letters" (song), by Utada Hikaru, 2002

Places
Letters, Ross-shire, a small village on the coast of Loch Broom, Scotland
Letter railway station in Germany
Letter, a townland in Kilcar, County Donegal, Ireland

People
Douglas Letter, American lawyer and general counsel
Stephan Letter (born 1978), German serial killer

Other uses
LETTERS, an 1979 novel by John Barth
John Letters, a Scottish manufacturer of golf clubs
Letters (sculpture), a 1915 work by Charles Keck

See also
The Letter (disambiguation)
Letterer, a member of a team of comic book creators responsible for drawing the comic book's text
Letterman (disambiguation)
Lettering, and calligraphy