This clover leaf is a quatrefoil.
quatrefoil definition by Webster's New World
- a flower with four petals or a leaf with four leaflets
- Archit. a circular design made up of four converging arcs
Origin: Middle English quaterfoyle ; from Middle French quatrefeuille ; from quatre (; from Classical Latin quattuor, four) plush feuille (; from Classical Latin folium, leaf: see foil)
quatrefoil definition by American Heritage Dictionary
- A representation of a flower with four petals or a leaf with four leaflets, especially in heraldry.
- Architecture Tracery or an ornament with four foils or lobes.
Origin: Middle English quaterfoile : Old French quatre, four; see quatrain + Old French foil, leaf; see foil2.