I was wondering if we could decode the lettering neat to the year-size tag on NFL jerseys I have seen Q O S

Chad Johnson game cut from NFL Auctions

(photo from ebay)

John Lynch From Grey Flannel

(photo from grey flannel)

Jeff Garcia Browns Jersey- the 6 does not mean +6 (see below)


(photo from ebay)

And sometimes there is no letter code


Derrick Brooks from his foundation