The term Rickenbacker, E.G. is a reference to the Rickenbacker International Corporation, a company that manufactures and distributes electric guitars and basses. The company was founded in 1931 by Adolph Rickenbacker and George D. Beauchamp and is best known for its iconic 'Ric' guitar designs. The crossword solution for this term is ACE, which stands for 'Adolph Rickenbacker Electric Company'.