I always thought it was quite logical the MSX2+ was called that way, as it had little changes compared to the MSX2. Hoverr, there are more 2+-es in this world. Like the
XRGB2+ upscan convertor
Streetfighter EX 2+
etc.
I wonder
a) Did ASCII start this unusal 2+ naming?
b) Can you spot more 2+ items on the web?
c) How many items were called '2+' as a reference to MSX?
enjoy! 
dunno if it's relevant
msx1 - msx2 - exception - msx3 (tR orso)
where the exception is the msx2+
Nemesis 1 - Nemesis 2 - Salamander (exception) - Nemesis 3
Xak 1 - Xak 2 - Fray (exception) - Xak 3 (T.o.G.)
hmm, it's prolly not relevant
msx1 - msx2 - exception - msx3 (tR orso)
turboR is not MSX3.
Xak 1 - Xak 2 - Fray (exception) - Xak 3 (T.o.G.)
Tower of Gazzel is not Xak 3.
hmm, it's prolly not relevant
idd
Fray takes place simultaneously with XAK2: Rising of the Red Moon. So it's not an exception
