See also: Caltrap in Pictorial Dictionary of Heraldry.
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A military obstacle, designed to rest point up and endanger those who might step upon it.
Default orientation: point to chief. No proper coloration.
Caltrop (1) §
Source: Pennsic Traceable Art. Artist: Unknown.
Caltrop (2) §
Source: Devises Heroiques et Emblemes. Artist unknown. (Page 197.)