Unicode

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The advent of Unicode solved many problems with dealing with APL glyphs, however there was still some wiggle room as to which Unicode code point were to be used in a Unicode implementation of APL, and different implementers made different choices. This article, which documents these differences, is adapted from an original paper by Bob Smith[1] that attempted to raise awareness of these issues because the differences impede transfer of information.

APL name Glyph Code point Unicode name APL2 Dyalog APL GNU APL NARS2000 ngn/apl dzaima/APL
Circle U+25CB White circle Yes Yes Yes Yes Yes Yes
U+26AA Medium white circle No No No Yes No No
Diamond U+22C4 Diamond operator Yes Yes Yes Yes Yes Yes
U+25C7 White Diamond No No No Yes No No
U+25CA Lozenge No No Yes Yes No No
U+2B26 Diamond No No Yes Yes No No

References

  1. Smith, Bob. APL Characters and Their Aliases. 14 Dec 2013–25 Dec 2019. Sudley Place Software.