To be conjugate in the context of mathematics, physics, or chemistry.

A U-shaped or crescent-shaped lake that forms when a wide bend in a river is cut off from the main channel

(mathematics) a pair of irrational numbers whose sum and product are both rational numbers

two complex numbers where the real parts are identical and the imaginary parts have opposite signs, such as "3+2i" and "3-2i"

(mathematics) the complex conjugate of a number, formed by changing the sign of its imaginary part

describing two complex numbers whose real parts are equal and whose imaginary parts are equal in magnitude but opposite in sign

ox yoke; oxbow

Niu'e Reef; a boomerang-shaped reef in the South China Sea claimed by China, Vietnam, and the Philippines, also known as Whitsun Reef or Julian Felipe Reef

a pair of lines passing through the same vertex of an angle such that they are symmetric with respect to the angle bisector