dollar sign

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The symbol ($), used mainly to indicate a dollar amount.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun punctuation symbol $, used to indicate a price in dollars.
• noun programming in certain languages (such as Perl or PHP), to indicate a variable.
• noun programming in certain languages, used to indicate a hexadecimal constant.
• noun programming in certain languages, used to indicate a constant.
• noun programming in certain languages (such as BASIC), to indicate a variable or a constant containing text (a string) as opposed to a number.
• noun programming in regular expressions, used to indicated the end of the string/line.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a symbol of commercialism or greed
• noun a mark ($) written before a number to indicate that it stands for the number of dollars