pound sign

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

• noun The symbol (£) for a unit of currency, especially the pound sterling.
• noun The symbol (#) for a pound as a unit of weight.

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

• noun UK The symbol £ representing the pound sterling.
• noun US The symbol # on a telephone.

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

• noun a symbol for a unit of currency (especially for the pound sterling in Great Britain)