Atomic vector

is the name of a 256-character vector which containes the entire character set of older APL implementations that did not support Unicode, but instead used a single byte to store each character. Its value varies wildly between dialects, and can even differ between editions of the same dialect.

Value
In the following, display of the the character sets are obtained using  to replace control characters with spaces.

APL2
APL2 uses two primary values of, an ASCII-based value on personal computers, and an EBCDIC-based value on mainframes. The ASCII-based value is: !"#$%&'*+,-./ 0123456789:;<=>? @ABCDEFGHIJKLMNO PQRSTUVWXYZ[\]^_ `abcdefghijklmno pqrstuvwxyz{|}~ ÇüéâäàåçêëèïîìÄÅ ⎕⍞⌹ôöòûù⊤ÖÜø£⊥₧⌶ áíóúñÑªº¿⌈¬½∪¡⍕⍎ ░▒▓│┤⍟∆∇→╣║╗╝←⌊┐ └┴┬├─┼↑↓╚╔╩╦╠═╬≡ ⍸⍷∵⌷⍂⌻⊢⊣⋄┘┌█▄¦Ì▀ ⍺ß⊂⊃⍝⍲⍴⍱⌽⊖○∨⍳⍉∊∩ ⌿⍀≥≤≠×÷⍙∘⍵⍫⍋⍒¯¨

APLX
In order to maximise the probability of being able to represent the text when converting from Unicode to internal representation, APLX accepts as input a number of alternative Unicode values for certain characters. However, these are automatically mapped to normalised character, and any unmappable characters are replaced with a question mark. ⍐ ⍗ ⍇⍈ ⍱⍲ ⍒⍋⌽⍉⊖⍟⌶⍫⍎⍕⍀⌿⍝⍞!⌹ ¨)<≤=>]∨^≠÷,+./ 0123456789([;×:\ ¯⍺⊥∩⌊∊_∇{⍳∘'⎕|⊤○ ⋄ABCDEFGHIJKLMNO PQRSTUVWXYZ∆⊣⍪$}

┌┐└┘─│┼├┤┴┬ Í "#%&@£`≡≢⍷⍸ ⍤⍥⌷ ÄÅÇÉÑÖÜáàâäãåçéè êëíìîïñóòô⍥õúùûü ÀÃÕ  Ææ⍬Øø¿¡ßÿ abcdefghijklmno pqrstuvwxyz⍙È€

Dyalog APL
is obsolete in Dyalog APL since the Unicode Edition was introduced and is only retained for backwards compatibility. It no longer contains all the glyphs used for primitive functions and operators, but can be adjusted by setting the Atomic Vector - Unicode variable to a list of Unicode code points. The default value is: ⌶ɫ%'⍺⍵ _abcdefghijklmno pqrstuvwxyz ¯.⍬ 0123456789 ⊢¥$£¢ ∆ABCDEFGHIJKLMNO PQRSTUVWXYZ ý· ⍙ÁÂÃÇÈÊËÌÍÎÏÐÒÓÔ ÕÙÚÛÝþãìðòõ{€}⊣⌷ ¨ÀÄÅÆ⍨ÉÑÖØÜßàáâä åæçèéêëíîïñ[/⌿\⍀ <≤=≥>≠∨∧-+÷×?∊⍴~ ↑↓⍳○*⌈⌊∇∘(⊂⊃∩∪⊥⊤ ⍪≡≢óôöø"# &´┘┐┌└ ┼─├┤┴┬│@ùúû^ü`∣¶
 * ⍷¿¡⋄←→⍝)]  §⎕⍞⍣

GNU APL
GNU APL is fully Unicode-aware, and only includes the atomic vector for completeness: !"#$%&'*+,-./ 0123456789:;<=>? @ABCDEFGHIJKLMNO PQRSTUVWXYZ[\]^_ `abcdefghijklmno pqrstuvwxyz{|}~ ¥€⇄∧∼≬⋆⋸⌸⌺⌼μ⍁¡⍣⍅ ⎕⍞⌹⍆⍤⍇⍈⍊⊤λ⍍⍏£⊥⍶⌶ ⍐⍑χ≢⍖⍗⍘⍚⍛⌈⍜⍢∪⍨⍕⍎ ⍬⍪∣│┤⍟∆∇→╣║╗╝←⌊┐ └┴┬├─┼↑↓╔╚╩╦╠═╬≡ ⍸⍷∵⌷⍂⌻⊢⊣◊┘┌█▄▌▐▀ ⍺⍹⊂⊃⍝⍲⍴⍱⌽⊖○∨⍳⍉∈∩ ⌿⍀≥≤≠×÷⍙∘⍵⍫⍋⍒¯¨

Documentation

 * APLX
 * Dyalog