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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