(mathematics) A function to be maximized or minimized in optimization theory.

(number theory, analytic number theory, uncountable) The function ζ defined by the Dirichlet series 𝜁(s)=∑ₙ₌₁ ᪲1/(nˢ)=1/(1ˢ)+1/(2ˢ)+1/(3ˢ)+1/(4ˢ)+⋯, which is summable for points s in the complex half-plane with real part > 1; the analytic continuation of said function, being a holomorphic function defined on the complex numbers with pole at 1.

(game theory) A mathematical function that assigns a real number to every element of the outcome space in a way that captures the agent's preferences over both simple and compound lotteries.

(game theory) A mathematical function describing the award given to a single player at the outcome of a game.

A not-for-profit or a public health insurance company, usually found in health care systems in Central Europe, such as Germany.

Any of various fungi with an irregularly branched fruiting body apparently of jelly-like consistency.

Tremella fuciformis, an edible jelly fungus.

(topology) For a specified topological space, the group whose elements are homotopy classes of loops (images of some arbitrary closed interval whose endpoints are both mapped to a designated point) and whose group operation is concatenation.

(finance) An analysis of a business with the goal of financial projections in terms of income statement, financial statements and health, its management and competitive advantages, and its competitors and markets.

Alternative spelling of Riemann zeta function