The moon is a heavenly body, Earth’s natural satellite, and may be emblazoned in several ways. A “moon in her complement” or “in her plenitude” is essentially a roundel with a human face; this form is found in the arms of de Fontibus, c.1225 [Parker 414], and the arms of Stein, c.1340 [Zurich 400]. An “increscent (or decrescent) moon” is a crescent with a human face in profile; this seems to be a later form, as in the arms of Weber, 1605 [Siebmacher 39]. (The illustration shows an increscent moon.)
According to Parker, a “moon proper” is argent, and a “moon eclipsed” is sable; but Society armory doesn’t recognize these definitions, permitting the moon to be in any tincture.
The Shire of Malagentia bears: Purpure, a moon in her complement within a laurel wreath argent.
Doniphan non Sequitur bears: Barry argent and sable, a moon in her plenitude azure.
Lourana Moonwind bears: Gules, a decrescent moon within an orle of mullets Or.