Dm

Symbol

 * 1)  Symbol for D minor.

Etymology
From.

Symbol

 * 1)  The domain of a specified function.
 * Dm(tan) = {x∈ℝ: x≠π/2 + zπ}, hvor z∈ℤ
 * The domain of the tangent function is the subset of real numbers that are not equal to π/2 plus some multiple of π.