Lituus
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Sestertius_Herennius_Etruscus-s2749.jpg
Sestertius_Herennius_Etruscus-s2749.jpg
A lituus (Latin for "crozier") is a spiral in which (in polar coordinates) the angle is inversely proportional to the square of the radius.
The lituus is asymptotic to the line θ=0.The lituus was a cult instrument in Roman religion.zh:连锁螺线