There are today some 5,000 languages and dialects in use throughout the world; in most instances, intercommunication among them ranges from difficult to impossible. This sourcebook of graphic symbols was compiled as a first step toward a basic means of communication through a system of universally recognizable symbols. The sourcebook is limited to those graphic symbols that give instructions, directions, or warnings, and they are organized in three ways: by discipline, a reference of symbols related to each given field of interest or application; by graphic form, a compilation permitting the identification of symbols out of context when unknown to the reader; and by meaning, a liberal alphabetical index which makes it possible to find all symbols relating to a basic design concept. Color is indicated on the symbols themselves throughout the book, and a separate section on the meanings of color in various cultures is included. In addition, the Table of Contents for this book appears in 18 languages to facilitate internationality of use. A bibliography is also included. (Author/SH)