Unicode

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 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