On Mon, 04 Aug 2014 23:19:41 +0100 Keith Marshall <keithmarsh...@users.sourceforge.net> wrote:
> OTOH, when a typewriter overstrikes, the accumulation of all glyphs > struck remains indelibly impressed on the printed page. [OT] The symbol set of APL took advantage of that property. The language defines some 60 symbols, more than fit on the special-order APL Selectric typeball. Some symbols were composed using the backspace. http://www.quadibloc.com/comp/aplint.htm "The letters of the alphabet could be overstruck with squares, circles, or several other symbols to increase the number of available variables." --jkl
