The mouse-over title on the latest xkcd points us to a classic argument over etymology vs. usage:
I don't know what's more telling–the number of pages in the Wikipedia talk page argument over whether the 1/87.0857143 scale is called "HO" or "H0", or the fact that within minutes of first hearing of it I had developed an extremely strong opinion on the issue.
The Wikipedia discussion in question is here. Short form: Once (a century ago) there were model railroad scales identified by numbers like 2, 1, and 0. Then (after WWI), in order to make table-top layouts more reasonable, a "half 0" scale was created. Over time — and from the beginning in some cases — the letter+number "H0" designation came to be treated as letter+letter "HO". Now North American usage (including by manufacturers, resellers, and hobbyists) is overwhelmingly "letter+letter", while European usage is apparently mixed.
One side of the Wikipedia discussion, familiar in concept if not in detail:
The correct name is "H0" or "half zero"; Google only shows that most people do it wrong.
"Interesting historical tidbits"? Do you even know what the word fact means?
You can't change a name just because a lot of people pronounce it the wrong way: the scale is called "H0", the only problem is that this "0" is pronounced "O" by some English speakers …
And on the other side:
My (and I assume that this goes for most of the editors here) comprehension of the situation is perfectly clear. It is yours that appears to be flawed. You seem to have forgotten that what was and what is are two separate situations. Your argument is the same as arguing that if a word is a Latin derivative, then it is still a Latin word and should be spelled the same. Do not continue to attempt to force your ideas by implying that anyone of a differing opinion is of lower intelligence.
The current state of the article seems to be mixed on the spelling.