One that signifies.
Linguistics A linguistic unit or pattern, such as a succession of speech sounds, written symbols, or gestures, that conveys meaning; a linguistic sign. The signifier of the concept "tree” is, in English, the string of speech sounds (t), (r), and (ē); in German, (b), (ou), and (m).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.