The coat of arms traditionally attributed to Satan in European heraldry. Blazoned "Gules, a fess Or between three frogs proper" (or with effectively equivalent blazons, such as "Gules, a fess Or between three frogs Vert", "Gules, a fess Gold between three frogs proper", etc.).

In the book The Heraldic Imagination by Rodney Dennys (1975), this is traced back to the late 13th-century Douce Apocalypse manuscript, in an illustration to Revelations 20:7-10.  The design is based on the "three unclean spirits like frogs" of verse 16:13.
This vector image includes elements that have been taken or adapted from this file:
AnonMoos