A trefoil (from the Latin trifolium, "three-leaved plant") is a graphic form composed of the outline of three overlapping rings, used in architecture and Christian symbolism, among other areas. The term is also applied to other symbols with a threefold shape. A similar shape with four rings is called a quatrefoil.
'Trefoil' is a term in Gothic architecture given to the ornamental foliation or cusping introduced in the heads of window-lights, tracery, and panellings, in which the centre takes the form of a three-lobed leaf (formed from three partially overlapping circles). One of the earliest examples is in the plate tracery at Winchester Cathedral (1222–1235). The fourfold version of an architectural trefoil is a quatrefoil.
A simple trefoil shape in itself can be symbolic of the Trinity, while a trefoil combined with an equilateral triangle was also a moderately common symbol of the Christian Trinity during the late Middle Ages in some parts of Europe, similar to a barbed quatrefoil. Two forms of a trefoil combined with a triangle are shown below:
Particularly in church architecture, such a layout may be called a "triconchos".
Evolution of layout of Maltese Megalithic temples; Skorba (upper right) has a typical trefoil plan
A typical triconchos
The heraldic 'trefoil' is a stylized clover. It should not be confused with the figure named in French heraldry tiercefeuille ("threefoil"), which is a stylized flower with three petals, and differs from the heraldic trefoil in being not slipped.[a]
Trefoil in heraldry
Or a fess sable between three trefoils vert
Gules a cross flory argent between four tiercefeuilles Or
Symmetrical trefoils are particularly popular as warning and informational symbols. If a box containing hazardous material is moved around and shifted into different positions, it is still easy to recognize the symbol, while the distinctive trefoil design of the recycling symbol makes it easy for a consumer to notice and identify the packaging the symbol has been printed on as recyclable. Easily stenciled symbols are also favored.
Fallout shelter trefoil
Universal recycling symbol
One particular stylized form of the heraldic trefoil is used as the main element in the logo of most Girl Guiding and Girl Scouting organizations. For Girl Scouts, the three trefoil leaves represent the three-fold promise: "To serve God and my country, to help people at all times, and to live by the Girl Scout law."
While the green trefoil is considered by many to be the symbol of Ireland, the harp has much greater officially recognized status. Therefore, shamrocks generally do not appear on Irish coins or postage stamps.
A trefoil is also part of the logo for Adidas Originals, which also includes three stripes.
U stara mirna vremena, kada je koji general držao smotru, pa se na cvjetnoj tratini skupili bataljoni zdravih četa u kalpacima i dolamama u paradi, svi okićeni trolistom hrastovim, svi ulašteni i izglačani, a trube udaraju i glazbe tresu zrakom, te tutnji kavalkada sa crvenim svilenim ruhom generaliteta i zelenim perjanicama, onda je bilo i neke inspiracije u tim puškohvatima. Svi stari soldati gledali su romantično na paradni osamnaesti augusta koji je počeo s topničkim salvama, a svršavao s lampionadom.
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