CEG

CEG is an acronym that can refer to multiple terms across different fields, and its meaning is typically determined by context. In music theory, CEG denotes the three pitch classes that form a C major triad: C, E, and G. The interval between C and E is a major third, and the interval between C and G is a perfect fifth. These notes can be arranged in different orders (inversions) while preserving the underlying triad, which serves as a foundational building block in major-key harmony and chord-symbol analysis.

Beyond music, CEG is used as an initialism for various organizations, groups, or concepts that begin with the letters C, E, and G. Because many three-word phrases can start with these letters, there is no single universal meaning for CEG. In any given document or discussion, the intended expansion should be clarified by surrounding context, such as the field of study, geographic origin, or explicit full form.

Overall, CEG is primarily recognized in two senses: as a notational shorthand for a C major triad in music, and as a flexible acronym that can stand for a variety of three-word names in non-musical contexts.