Well, prop canon - that is, the letters they use in the scenery and props and effects (including, as far as I can tell, the display in the current episode) has 25 letters, 10 numbers (and the Stargate symbols, which are a syllabary, but not usually used for standard text.)
Stargate has been known to contradict prop canon before, but I think the Ancient alphabet is pretty well established after showing up consistently, in bits and pieces, for nine seasons.
But like I said, even if there's a hundred letters in the alphabet, improvised tap code would *still* have been quicker than going through it with yes/no questions!
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Stargate has been known to contradict prop canon before, but I think the Ancient alphabet is pretty well established after showing up consistently, in bits and pieces, for nine seasons.
But like I said, even if there's a hundred letters in the alphabet, improvised tap code would *still* have been quicker than going through it with yes/no questions!