Hmmmm...it's not so much about
SEO there as it is about ease of communication - when you think about how we offer up our domain names to potential clients...how to get around the "it's the number 4 not the word 'four'" explanation every time?
But with your example in mind, it's actually not necessarily a *bad* thing, in terms of
SEO...and it would turn up first in any alphabetical search returns.