0C (zero C) or 0-C may refer to: * 0 °C, the melting point of water on the Celsius scale * 0C, or zero carbon * Zero carbon building * Zero carbon city * 0 configuration networking, or Zero configuration networking, a set of techniques that automatically creates a usable Internet Protocol (IP) network * 0-coupon bond, or Zero-coupon bond, a type of discount bond * 0 copula, or Zero copula, a linguistic phenomenon where a subject is joined to a predicate without overt marking of this relationship * 0 crossing, or Zero crossing, a point where the sign of a function crosses the zero axis * 0 consonant, or Zero consonant, a consonant-like letter that is not pronounced