This publication provides a quick reference to the letter symbols and corresponding terms that are defined in JESD77-B, Terms, Definitions, and Letter Symbols for Discrete Semiconductor and Optoelectronic Devices; JESD99-A, Terms, Definitions, and Letter Symbols for Microelectronic Devices, and JESD100-B, Terms, Definitions, and Letter Symbols for Microcomputers, Microprocessors, and Memory Integrated Circuits. It is intended to simplify interpretation of data sheets and specifications and to promote the uniform use of these symbols. The symbols relate to ratings and characteristics found in data sheets and other specifications. Some abbreviations used in lieu of symbols are also included. The newly added Annex B is provided as an aid to determining what symbol should be used and is organized by term, whereas the main body of the publication is organized by symbol or abbreviation as in previous versions. This version contains minor revisions.