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The lituus is the locus of the equation expressed in Polar coordinates as:

$r^2 \theta = a^2$


Also see

  • Results about litui can be found here.

Linguistic Note

The word lituus literally means trumpet in Latin.

An ancient Roman-Etruscan trumpet differs in shape from the contemporary instrument.

It is also a fancy staff or wand used in certain religious rituals. Its shape echoes that of the lituus.

Its plural form is litui.