square knot

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

• noun A common double knot in which the loose ends are parallel to the standing parts, most often used to join the ends of two cords or lines.

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

• noun A common binding knot.

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

• noun a double knot made of two half hitches and used to join the ends of two cords