A pattern by overlapped each quarter line of the same-sized circle, or by connecting four ellipses in circle and putting their inner line together alternately to form another circle in their extension.
同じ大きさの円(数学)の円周を四分の一ずつ重ねて繋いだ文様、または四つの楕円を円形につなぎ合わせ、楕円の内径線が延長線上で再び円形になるよう互い違いに組み合わされた文様