unit numbering

Can anyone please explain what the last three digits of a unit # represent?
i.e. unit 33XX P07, unit 27XX P11, unit 28XX P22
Thanks

On floating weeks I believe it has to do with tracking. Such as with one of my units it is VG*1812*25*B which I believe means:

Vegas / 18th floor / Unit 12 / Week 25 / Every Year

Granted this would be only a reference to a unit rather than a dedicated unit as it is a floating week but they have to have some methodology for tracking the sale as a piece of the building.

This is sort of a guess by deduction as I know that unit 12 at the Marriott Grand Chateau is always going to be the 2BR unit of a 3BR in Tower #1.

This of course could be different for different companies:

Brion