typographical error

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

• noun A mistake in printing, typesetting, or typing, especially one caused by striking an incorrect key on a keyboard.

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

• noun A mistake made during the process of typing, especially one caused by a slip of the fingers; often shortened to typo.

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

• noun a mistake in printed matter resulting from mechanical failures of some kind