A non-number could be either a Numberwang OR a Wanganumb - this does depend on whether Yorkshire is a pudding or not.

It's not well known, but in February of 1983, there was a finch in the Galapagos that was found to be numberwang. And of course there was the famous incident in the 1994 World Series where a homerun was overturned because it turned out it was a wangernumb hit into the stands, and not a standard baseball.