* Botanical: The trefoil leaves of the clover plant are a symbol of luck.
* Heraldry: The coat of arms featured a golden trefoil on a field of blue.
* Architecture: The stained glass window depicted a trefoil arch, adding a touch of elegance to the cathedral.
* Design: The Celtic knot was intricately woven with trefoils and other geometric patterns.
* Folklore: According to legend, finding a four-leaf trefoil brings good fortune.
These examples illustrate the different contexts in which the word "trefoil" can be used. It can refer to the shape of a plant, a symbol in heraldry, an architectural element, or a design motif.