What does the K in K rations stand for? March 16, 2012 by Pamela Landy · Filed Under: Inventions Most likely, the K in K rations represents the first letter of the last name of the product’s developer, Ancel Keys (b. 1904). Keys, a physiologist from Minnesota, developed the portions of food for soldiers in World War II. Related PostsWhat does O.K. stand for?What does the ZIP in ZIP code stand for?What does E = mc2 stand for?What does the name Kodak stand for?What does the name Sanka stand for?