picket fence

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

• noun A fence made of upright pointed boards fastened at intervals to rails that extend between posts.

from The Century Dictionary.

• noun A fence formed of pickets or narrow vertical boards, often pointed, nailed at close intervals to cross-bars or rails supported by posts, into which they are often mortised.

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

• noun A simple fence made from wooden pickets, connected by horizontal bars.

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

• noun a fence made of upright pickets