Rei comes from the Japanese word ‘Reigi’ which means ‘Respect, Courtesy, Manners’.
Rei (Bow) respect, etiquette, and manners are some of the most important and foremost required qualities from a person who wishes to learn Japanese martial arts.
One shows respect by Rei (Bow) to his/her Sensei, fellow Karate students, and even Dojo (training hall) upon entering and at the time of leaving. During training sessions when you train with partners, you bow.
Rei is much more than the physical action of a Bow as it changes one’s behaviour demonstrating gratitude, humility, and regard towards others.