lituus
noun/ˈlɪtju.əs/
Etymology Unadapted borrowing from Latin lituus.
1
A military trumpet.
- 1786: Fig. 3. A Roman Lituus, or military trumpet, such as is mentioned by Horace in his first ode. — Francis Grose, A Treatise on Ancient Armour and Weapons, page vi.
2
An augur's staff with a recurved top.
3
Geometry, Mathematics, Sciences A curve with polar equation r²θ=a², where a is a constant.