Lituus

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A lituus (reverse, right, over the patera) as cult instrument, in this coin celebrating the pietas of the Roman Emperor Herennius Etruscus.

A lituus (Latin for "crozier") is a spiral in which (in polar coordinates) the angle is inversely proportional to the square of the radius.

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The lituus is asymptotic to the line θ=0.

The lituus was a cult instrument in Roman religion.

See also: Lituus, Asymptote, Crozier, Herennius Etruscus, Inversely proportional, Latin, Patera, Pietas, Polar coordinates, Roman Emperor