See also: Skull in Pictorial Dictionary of Heraldry.
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A human skull.
Default orientation: affronty. Proper coloration: argent. (The eye sockets should be colored as well, not voided.)
Skull Facing Dexter §
Source: Codex Zouche-Nuttall. (British Museum Am1902,0308.1.) Artist unknown. Adapted by Máel Brigte.
Jawless Skull or Death's Head §
A skull without the jawbone is often called a “death’s head.”
Source: Pennsic Traceable Art Archives. Artist: Ian Raven of Tadcaster.