Castlevania uses Heart icons as ammunition for Sub-Weapons throughout the series. In most games the heart symbol is used as health replenishment.
Related ThreadsHearts Team Guide/Discussion - 9.0.1 - last post by @ Dec 29, 2008
Hearts Team Guide - 9.3.0 Patch - last post by @ Jul 28, 2009
Heart of Midlothian - Team Guide - last post by @ Apr 16, 2007
Hearts back on top - last post by @ Jun 25, 2010
Hearts - 2nd Season - last post by @ Dec 21, 2008