Hungerford knot
Encyclopedia
The Hungerford or Hastings knot is a type of decorative unknot
Unknot
The unknot arises in the mathematical theory of knots. Intuitively, the unknot is a closed loop of rope without a knot in it. A knot theorist would describe the unknot as an image of any embedding that can be deformed, i.e. ambient-isotoped, to the standard unknot, i.e. the embedding of the...

, and is a heraldic knot
Heraldic knot
A heraldic knot is a knot, unknot, or design incorporating a knot used in European heraldry. While a given knot can be used on more than one family's achievement of arms, the family on whose coat the knot originated usually gives its name to the said knot...

 used primarily in English heraldry. It is most notable for its appearance on the Hungerford and Hastings family heraldic badges.
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