This document includes extensive information on: letter symbol conventions; diodes and rectifiers (including signal, rectifier, microwave, tunnel and backward, voltage-regulator, voltage-reference, current regulator, and varactor diodes); transistors (including FETs, JFETs, and IGBTs); photosensitive devices, photoemitters, and optocouplers; thyristors and PUTs; and transient voltage suppressors. Terms and symbols, with their definitions, are arranged alphabetically by product type. Where applicable, graphical symbols are also included. The purpose of this standard is to promote the uniform use of symbols, abbreviations, terms, and definitions throughout the semiconductor industry.