I'd actually never thought about it, and I would have spelled it without the hyphen, as in H2G2. I googled and found about a 3-2 preference for the word without the hyphen, but many of the citations were the same.

And I remember this word from many years ago when a bunch of us were searching for words that had double letters in them. Double-aitch ain't that common. And thank God Exxon proved that a big oil company didn't have to be Humble.


TEd