ISO-IR-68

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]

APL Character Set for Workspace Interchange

Alias(es)	IBM-371, ISO-IR-68
Language(s)	APL syntax and symbols
Created by	Canadian Standards Association APL Working Group
Classification	7-bit modified ASCII with mandatory BS composition
v t e

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. Cowan, John (2020-07-17). "ISO-IR-68 to Unicode". Unicode.org. Unicode, Inc. Retrieved 2020-07-20.
2. 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.