The signal flags hanging on the front of The Krusty Krab do not spell a word. The third signal flag (from left to right, facing the front door) doesn't exist in international nautical code. The first, second, fourth, and fifth are R, I, U, and K, although the U is only "right-side-up" if the flags are read from right-to-left. Inside Mr. Krabs' office is _, I, R, and M. The _ has no letter associated with the flag.