T-number

T-number or T number may refer to:


 * A numerical system for the glyphs within the Pre-Columbian Mayan script, see J. Eric S. Thompson.
 * Dvorak technique, a system to subjectively estimate tropical cyclone intensity
 * Viral capsid T-number, a system to describe the icosahedral surface quasi-symmetry pattern
 * In music, the transposition of a tone row
 * In number theory, a transcendental number having finite, but unbounded, transcendence measure.
 * T-number (photography), a transmission aperture value in photography