trefoil
Pronunciation:
/ˈtɹiː.fɔɪl/noun
Definitions
Any of several plants of the pea family, having compound, trifoliate leaves; especially one of the genus Trifolium.
A symbol having the shape of such leaves, especially when used as an architectural ornament.
noun
Definitions
A knot formed by joining the two loose ends of a overhand knot to form a knotted loop; the simplest non-trivial knot.