APL Character Set for Workspace Interchange
Alias(es)IBM-371, ISO-IR-68
Language(s)APL syntax and symbols
Created byCanadian Standards Association APL Working Group
Classification7-bit modified ASCII with mandatory BS composition

The APL Character Set for Workspace Interchange, registered for use with ISO/IEC 2022 as ISO-IR-68,[1] is a character set developed by the APL Working Group of the Canadian Standards Association.[2] IBM calls it Code page 371.[3] It is one of several APL code pages used for the syntax and symbols used by the APL programming language.[2]

Character set

ISO IR-68[1]
0 1 2 3 4 5 6 7 8 9 A B C D E F
0x NUL SOH STX ETX EOT ENQ ACK BEL  BS   HT   LF   VT   FF   CR   SO   SI  
1x DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN  EM  SUB ESC  FS   GS   RS   US 
2x  SP  ¨ ) < ≤ = > ] ∨ ∧ ≠ ÷ , + . /
3x 0 1 2 3 4 5 6 7 8 9 ( [ ; × : \
4x ¯ ⍺ ⊥ ∩ ⌊ ∊ _ ∇ ∆ ⍳ ∘ ' ⎕ ∣ ⊤ ○
5x ⋆ ? ⍴ ⌈ ∼ ↓ ∪ ⍵ ⊃ ↑ ⊂ ← ⊢ → ≥ -
6x ⋄ A B C D E F G H I J K L M N O
7x P Q R S T U V W X Y Z { ⊣ } $ DEL

Composite characters

The encoding intends that certain of the above characters should be able to be represented at the same character position to produce additional symbols required for APL as composite characters, such as the following:[2]

Combined characters Composite character(s) Unicode
÷ and ⎕ ⌹ U+2339 APL FUNCTIONAL SYMBOL QUAD DIVIDE
_ and ∆ ⍙ U+2359 APL FUNCTIONAL SYMBOL DELTA UNDERBAR
_ and A to Z A to Z
∘ and ⊥ ⍎ U+234E APL FUNCTIONAL SYMBOL DOWN TACK JOT
∘ and ∩ ⍝ U+235D APL FUNCTIONAL SYMBOL UP SHOE JOT
∘ and ⊤ ⍕ U+2355 APL FUNCTIONAL SYMBOL UP TACK JOT
' and . ! U+0021 EXCLAMATION MARK
' and ⎕ ⍞ U+235E APL FUNCTIONAL SYMBOL QUOTE QUAD
| and ∇ ⍒ U+234B APL FUNCTIONAL SYMBOL DEL STILE
| and ∆ ⍋ U+2352 APL FUNCTIONAL SYMBOL DELTA STILE
○ and \ ⍉ U+2349 APL FUNCTIONAL SYMBOL CIRCLE BACKSLASH
○ and | ⌽ U+233D APL FUNCTIONAL SYMBOL CIRCLE STILE
○ and ⋆ ⍟ U+235F APL FUNCTIONAL SYMBOL CIRCLE STAR
○ and - ⊖ U+2296 CIRCLED MINUS
∼ and ∧ ⍲ U+2372 APL FUNCTIONAL SYMBOL UP CARET TILDE
∼ and ∨ ⍱ U+2371 APL FUNCTIONAL SYMBOL DOWN CARET TILDE
∼ and ∇ ⍫ U+236B APL FUNCTIONAL SYMBOL DEL TILDE
- and / ⌿ U+233F APL FUNCTIONAL SYMBOL SLASH BAR
- and \ ⍀ U+2340 APL FUNCTIONAL SYMBOL BACKSLASH BAR

References

  1. ^ a b Cowan, John (2020-07-17). "ISO-IR-68 to Unicode". Unicode.org. Unicode, Inc. Retrieved 2020-07-20.
  2. ^ a b c Standards Council of Canada (1983-06-01). APL Character Set for Workspace Interchange (PDF). ITSCJ/IPSJ. ISO-IR-68.
  3. ^ "Code Page 00371" (PDF). IBM. Archived from the original (PDF) on 2015-07-08.
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