One-letter words? How many can there be? Certainly "a" and "I" are obvious, but isn't that about it? Well, no, to put it in a two-letter word. In fact, there are hundreds of one-letter words, used in science, literature, sports, music, medicine, economics, and popular culture. For instance, what letter means "the color black"? Which one means "exactly"? Surely you know what letter represents a strikeout in baseball. Want more? This deck presents sixty-four of the English language's smallest words on forty-eight cards, with definitions on the front and answers on the back. Author Craig Conley is the creator of the book One-Letter Words: A Dictionary (HarperCollins, 2005).