I have started playing the German language version of Words With Friends. I play with one friend who used to be my German teacher in high school. But I also play with a computer opponent, and was dumbfounded by a "word" it played during one of our sessions: Ln.
I couldn't imagine it being a valid word as it looked more like an abbreviation. I also consulted the various online dictionaries and translation tools but without success.
Should I consider this a bug in the game, or is there such a word?