The signature is usually called a chunk id, chunk identifier, or tag identifier.
From the en.wikipedia.org
An electronic health identifier will be issued for each Australian who wants one.
From the economist.com
Much of the time, it's completely unnecessary to use age as an identifier at all.
From the newoldage.blogs.nytimes.com
In such a case, the SSN can be used as a unique identifier of a given individual.
From the en.wikipedia.org
It was released for public sale under the 12AX7 identifier on September 15, 1947.
From the en.wikipedia.org
A two-digit age identifier, which changes twice a year, in March and September.
From the en.wikipedia.org
Given that airports employ local people, the identifier AD might come in handy.
From the newscientist.com
The International Standard Text Code is a unique identifier for text-based works.
From the en.wikipedia.org
An identifier may be a word, number, letter, symbol, or any combination of those.
From the en.wikipedia.org
More examples
A symbol that establishes the identity of the one bearing it
An identifier is a unique expression in a written format either by a code, by numbers or by the combination of both to distinguish variations from one to another among a class of substances, items, or objects. ...
In metadata, an identifier is a language-independent label, sign or token that uniquely identifies an object within an identification scheme.
Someone who identifies; a person who establishes the identity of; Something that identifies or uniquely points to something or someone else; A guidebook that helps determine the specific class of an object (such as a mushroom, herb, fish, bird, drug, or mineral), or its individual identity (such ...
(Identifiers) These can include a user or USC identifier, identifiers for keys, and identifiers for the RAC or recovery agents.
(Identifiers) These are particularly selective table fields. They are usually characterized by consecutive numbers (document number, object number, and so on) since they are assigned using a number range object.
(Identifiers) are names used to indicate a variable, property, object, function, or method. The first character must be a letter, underscore(_), or dollar sign($). Each subsequent character must be a letter, number, underscore(_), or dollar sign($). For example, firstName is the name of a variable.
A legally formed name for most anything in which a computer program might be interested. Many languages (including Perl) allow identifiers that start with a letter and contain letters and digits. Perl also counts the underscore character as a valid letter. ...
Name or number given to a clip or segment of a video to allow for easy recognition of the segment and its contents.