An ordinary with a circular boss in the middle is described as nowy.
An ordinary with a square boss is called quadrate or, more fully, nowy quadrate. A saltire quadrate has the square boss turned lozengeways, with edges parallel to those of the saltire. An ordinary with a lozenge-shaped boss is called nowy lozengy or nowy of a lozenge (applies also to saltires)
Nowy and quadrate are usually applied only to the cross, saltire, pale, fess and bend.
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a cross nowy -
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a fess nowy -
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a cross quadrate -
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a saltire quadrate -
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a bend nowy lozengy -
Read more about this topic: Variations Of Ordinaries