In heraldry, a caldron (also known as cooking-pot) charge can be frequently found in the coats of arms of prominent Spanish nobility. This is related to a tradition of king granting a pennon and caldron (Spanish; Castilian: peñon y caldera) upon admittance to the upper crust of nobility, the ricohombres. Woodward & Burnett suggest to count the caldron among the military charges, as pennon was related to the ability of a noble to raise and lead troops, and caldron represented the ability to feed them.
Caldron frequently issues multiple serpents (also can be interpreted as eels), forming the so-called Spanish; Castilian: caldera gringolada.