The ATRA crossword solution is a four-letter word that refers to the Gillette Razor Brand. Gillette is a brand of safety razors and other personal care products owned by Procter & Gamble. It was founded in 1901 by King C. Gillette and is one of the most recognized brands in the world. The ATRA stands for 'All-Terrain Razor, ' which is a type of razor designed for use in wet or dry conditions.