Different term/same thing, or different thing?

I have seen references to a Starrett JR square, but I don't understand if it is different then a small 4 or 6" Starrett square in some way.

Is it just an old marketing thing (buy your kid this....), or is the blade size different (width), etc?

Thanks

the junior (33) is the smaller of the starrett combination squares. the blade size is different for the two squares. they both come with varying lengths. hope that helps...