On 18 Feb 2016, at 10:16, Hans Hagen <pra...@wxs.nl<mailto:pra...@wxs.nl>> wrote:
also, DEK used a keyboard with some special characters (probably dating from those assembler like computer languages) which is why the plain tex format has: Could it have been a keyboard especially for the APL language? Just a wild guess, but I remember that language using a lot of such symbols. Hans van der Meer
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