You lock yourself in a bathroom stall

You pick up a hardcover dictionary and move steadily toward the bathroom. As you draw near, you see the sign prohibiting merchandise in the bathroom. Nevertheless, you bring the thick book with you.

Upon entering the bathroom, you wash your hands in an attempt to scrub off the mysterious number. It is no use. You continue scrubbing until the number smears.

“Ok, at least it’s not a tattoo,” you realize. It occurs to you that the number may be an ISBN or some other type of clue, but now it is too smeared to decipher. You hide in the bathroom stall with the dictionary.

Several minutes pass while you amuse yourself by looking up vaguely familiar words.

“Oh, so that’s what myrrh is.”

You hear soft footsteps. The bathroom door opens and a man (presumably) begins to urinate.