The definition of a moniker is a name or nickname.
Your nickname is an example of your moniker.
moniker definition by Webster's New World
a person's name or nickname
Origin: origin, originally hobo term ; from uncertain or unknown; perhaps Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc. moniker definition by American Heritage Dictionary
mon·ick·er noun Slang
A personal name or nickname.
Origin: Probably from Shelta munik, name, possibly alteration of Irish Gaelic ainm, from Old Irish; see nō̆-men- in Indo-European roots. The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. moniker - Computer Definition
(1) A name, title or alias. See alias.
(2) A COM object that is used to create instances of other objects. Monikers save programmers time when coding various types of COM-based functions such as linking one document to another (OLE). See COM and OLE.