This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
"][", "II", and "//" tend to be used pretty much interchangably for any
model of Apple II computer, although, practically speaking, there are a few
usages which may provoke a correction.
"][" is the original Apple II symbol. It appears on all early II's and
II+'s as well as on the Disk ][ drive. It is, easily, the most attractive and
distinctive II symbol; but, it is also associated with old Apple II 's. The
"//" usage is associated with the c and newer e models.
"II" is widely accepted as 'okay' for all Apple II models. (And "II" and
"A2" are commonly used for referring to series-wide products, etc. as in "II
software", "A2 programmers", ... .)
The generally preferred machine designations are ...
Apple ][ or Apple II for pre-II+ models
Apple ][+ or Apple II+
Apple IIe for non-enhanced IIe computers
Apple //e for 128k enhanced //e computers
Apple //c
Apple IIc+
Apple IIgs or GS or best (if you have the fonts for a small "GS") IIGS
--Rubywand
 
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