Tau

Tau is a two-letter noun used in mathematics and physics to denote a constant or a statistical measure; in religious contexts it’s a letter of the Greek alphabet. In mathematics, it’s often used as the constant equal to 2π, signifying a full circle. In other domains, Tau can represent tau proteins or time constants, depending on the field. The pronunciation is typically a single syllable: /taʊ/ or /tɔː/ in some accents, but usage-specific terms may vary.