Yeah, I find this kind of abbreviation annoying. But there's a few words that are commonly abbreviated like this:
i18n -> internationalization
l10n -> localization
g11n -> globalization
l12y -> localizability
a11y -> accessibility
It bothers me because my brain does not jump from the abbreviation to the underlying word. I really need to stop and think about each one. And I get the numbers wrong when writing them.