"A crest is a component of a heraldic display, consisting of the device borne on top of the helm. Originating in the decorative sculptures worn by ...
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knights in tournaments and, to a lesser extent, battles, crests became solely pictorial after the 16th century (the era referred to by heraldists as that of "paper heraldry").
A normal heraldic achievement consists of the shield, above which is set the helm, on which sits the crest, its base encircled by a circlet of twisted cloth known as a torse. The use of the crest and torse independently from the rest of the achievement, a practice which became common in the era of paper heraldry, has led the term "crest" to be frequently but erroneously used to refer to the arms displayed on the shield, or to the achievement as a whole." - (en.wikipedia.org 20.12.2021)
