Quite often you'll hear "Cleared to land (or touch & go) number 4, number 3 is on extended left base" at the airport I fly at.
My friend (who flies with the orange company) came over to revalidate his FAA papers last week was shocked to hear "Cleared to land number 3".
I guess it's not normal practise back home?
The guys and girls in the tower at KSEE need a a medal