Signature

n. person's name or mark used when signing a document; signing of one's name; sign used to indicate key and tempo (Music); distinguishing feature; printed and folded sheet that comprises one section of a book (Printing)

A signature (from Latin signare, "sign") is a handwritten (and sometimes stylized) depiction of someone's name, nickname or even a simple "X" that a person writes on documents as a proof of identity and intent. The writer of a signature is a signatory. Like a handwritten signature, a signature work describes the work as readily identifying its creator.
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Noun
1. your name written in your own handwriting
(hypernym) name
(hyponym) allograph
(part-meronym) paraph
(derivation) sign, subscribe
2. a distinguishing style; "this room needs a woman's touch"
(synonym) touch
(hypernym) manner, mode, style, way, fashion
(hyponym) common touch
3. a melody used to identify a performer or a dance band or radio/tv program
(synonym) signature tune, theme song
(hypernym) tune, melody, air, strain, melodic line, line, melodic phrase
4. the sharps or flats that follow the clef and indicate the key
(synonym) key signature
(hypernym) musical notation
5. a sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book
(hypernym) sheet, piece of paper, sheet of paper
(part-holonym) book

n. signing up, signature, indorsement

(v. t.)
To mark with, or as with, a signature or signatures.
  

(v. t.)
The printed sheet so marked, or the form from which it is printed; as, to reprint one or more signatures.
  

(v. t.)
The designation of the key (when not C major, or its relative, A minor) by means of one or more sharps or flats at the beginning of the staff, immediately after the clef, affecting all notes of the same letter throughout the piece or movement. Each minor key has the same signature as its relative major.
  

(v. t.)
That part of a prescription which contains the directions to the patient. It is usually prefaced by S or Sig. (an abbreviation for the Latin signa, imperative of signare to sign or mark).
  

(v. t.)
Especially, the name of any person, written with his own hand, employed to signify that the writing which precedes accords with his wishes or intentions; a sign manual; an autograph.
  

(v. t.)
An outward mark by which internal characteristics were supposed to be indicated.
  

(v. t.)
A sign, stamp, or mark impressed, as by a seal.
  

(v. t.)
A resemblance between the external characters of a disease and those of some physical agent, for instance, that existing between the red skin of scarlet fever and a red cloth; -- supposed to indicate this agent in the treatment of the disease.
  

(v. t.)
A letter or figure placed at the bottom of the first page of each sheet of a book or pamphlet, as a direction to the binder in arranging and folding the sheets.