Header

A mainly male style of electrical connector mounted on printed circuit boards - Headers enable a board to be stacked on another, or be placed on breadboard for prototyping.

Often breakout boards will ship with holes in the board ready for a user to solder their own headers into them.

=Reference=
 * http://en.wikipedia.org/wiki/Header
 * http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=114