# Signature (disambiguation)

A signature is a mark used to confirm a person's identity or intent.
Signature may also refer to:

## Businesses and organizations

* Signature (charity), for deaf communication activities in the UK
* Signature, a clothing brand of Levi Strauss & Co.
* Signature (dance group) English Bhangra dance duo Suleman Mirza and Madhu Singh
* Signature (typography journal), a 20th-century British journal
* Signature (whisky), an Indian whisky brand
* Signature Books, a publisher of Mormon works
* Signature Digital Menus, a sign company
* Signature Flight Support, a British fixed-base operator
* Signatures Restaurant, former restaurant once owned by Washington lobbyist Jack Abramoff
* Signature School, a charter school in Evansville, Indiana
* Signature Team, a French motor racing team
* Signature Theatres, a movie theatre chain

## Computing

* Signature block, text automatically appended at the bottom of electronic messages
* Electronic signature, a digital form of identity or intent validation
* File signature, data used to identify or verify the contents of a file
* Type signature, a definition of the inputs and outputs for a function or method
* XML Signature, a W3C recommendation

## Cryptography

* Blind signature, a digital signature used to validate a disguised message
* Digital signature (or public-key digital signature), a method for authenticating informationq
* Key signature (cryptography), the result of applying a hash function on a key

## Mathematics

* Signature (logic), a description of a set of function and relation symbols in mathematical logic
* Signature (permutation), a measure for the number of pairs a permutation maps out of order
* Signature (quadratic form), the number of positive, negative, or null terms of a quadratic form
* Signature (topology) of a 4k-dimensional compact oriented manifold
* Signature of a knot, in knot theory
* Prime signature, the multiset of exponents in the prime factorisation of a number
* Signature (matrix), the difference of the positive and negative eigenvalues of a matrix
* Metric signature of the metric tensor on a pseudo-Riemannian manifold

## Music

* Key signature, symbols placed on the staff designating notes to be played sharp or flat
* Signature (Moya Brennan album), 2006
* Signature (Joe album), 2009
* Signature (Patrice Rushen album), 1997
* Signature, a 2021 EP by the Filipino singer Morissette
* Signature Records, a mid-20th century United States-based record label
* Time signature, indicating how many beats are in each measure

## Science

* Acoustic signature, a combination of acoustic emissions
* Isotopic signature, a characteristic set of ratios of stable or unstable isotopes
* Metric signature, in physics, the form of a metric tensor: the sign of the diagonal components
** Signature change, in relativity
* Radar cross-section
* Spectral signature, the specific combination of varying wavelengths reflected and absorbed which can uniquely identify an object

## Bookbinding

* Signature (bookbinding), a group of sheets folded in half
* Signature mark, a mark at the bottom of a group of sheets to assist in collation
* An alternative word for section (bookbinding)

## Other uses

* Signature Bridge, over the Yamuna river, Delhi, India
* Signature crime, a crime which exhibits characteristics unique to an offender's psychology
* Signature Place, a residential skyscraper in St. Petersburg, Florida