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* [[glyphs]] other than the Roman alphabet or Arabic numerals; the reader either parses them as punctuation or mathema * most primitive functions have Roman-alphabet names

* System constants are handy values like the [[alphabet]] (<syntaxhighlight lang=apl inline>⎕A</syntaxhighlight>), but can also b

...[digits]] <syntaxhighlight lang=apl inline>⎕D</syntaxhighlight>, and the [[alphabet]] (<syntaxhighlight lang=apl inline>⎕A</syntaxhighlight>).

...the leftmost and rightmost letters of the [[wikipedia:Greek alphabet|Greek alphabet]]:

...the leftmost and rightmost letters of the [[wikipedia:Greek alphabet|Greek alphabet]]. They therefore denote the left and right arguments of [[dfn]]s, respecti

...ts, "I obtained 'BQN' by moving each letter in 'APL' forward by one in the alphabet. I'd come up with the backronym 'Big Questions Notation' by the time I real

:<nowiki>*</nowiki> [[Dyalog APL]] maps the traditional APL underscored alphabet to [[Unicode]]'s circled uppercase letters.

...s at a time using <syntaxhighlight lang=apl inline>⊥</syntaxhighlight> and alphabet X ||style="text-align: right;"|<syntaxhighlight lang=apl inline>X←C1</syn

* '''Integrating ordinary type and many languages with the APL alphabet and keyboard'''. Paul Berry. [https://doi.org/10.1145/17701.255342].