ISO-IR-68

ISO-IR-68[1] is a character set developed by the Canadian Standards Association, and registered for use in ISO character set designation mechanisms.[2] It is used to represent the 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
0_	NUL 0000	SOH 0001	STX 0002	ETX 0003	EOT 0004	ENQ 0005	ACK 0006	BEL 0007	BS 0008	HT 0009	LF 000A	VT 000B	FF 000C	CR 000D	SO 000E	SI 000F
1_	DLE 0010	DC1 0011	DC2 0012	DC3 0013	DC4 0014	NAK 0015	SYN 0016	ETB 0017	CAN 0018	EM 0019	SUB 001A	ESC 001B	FS 001C	GS 001D	RS 001E	US 001F
2_	SP 0020	¨ 00A8	) 0029	< 003C	≤ 2264	= 003D	> 003E	] 005D	∨ 2228	∧ 2227	≠ 2260	÷ 00F7	, 002C	+ 002B	. 002E	/ 002F
3_	0 0030	1 0031	2 0032	3 0033	4 0034	5 0035	6 0036	7 0037	8 0038	9 0039	( 0028	[ 005B	; 003B	× 00D7	: 003A	\ 005C
4_	¯ 00AF	⍺ 237A	⊥ 22A5	∩ 2229	⌊ 230A	∊ 220A	_ 005F	∇ 2207	∆ 2206	⍳ 2373	∘ 2218	' 0027	⎕ 2395	∣ 2223	⊤ 22A4	○ 25CB
5_	⋆ 22C6	? 003F	⍴ 2374	⌈ 2308	∼ 223C	↓ 2193	∪ 222A	⍵ 2375	⊃ 2283	↑ 2191	⊂ 2282	← 2190	⊢ 22A2	→ 2192	≥ 2265	- 002D
6_	⋄ 22C4	A 0041	B 0042	C 0043	D 0044	E 0045	F 0046	G 0047	H 0048	I 0049	J 004A	K 004B	L 004C	M 004D	N 004E	O 004F
7_	P 0050	Q 0051	R 0052	S 0053	T 0054	U 0055	V 0056	W 0057	X 0058	Y 0059	Z 005A	{ 007B	⊣ 22A3	} 007D	$ 0024	DEL 007F

  Letter   Number   Punctuation   Symbol   Other   Undefined

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
_ and ∆	⍙	U+2359
_ and A to Z	A to Z
∘ and ⊥	⍎	U+234E
∘ and ∩	⍝	U+235D
∘ and ⊤	⍕	U+2355
' and .	!	U+0021
' and ⎕	⍞	U+235E
| and ∇	⍒	U+234B
| and ∆	⍋	U+2352
○ and \	⍉	U+2349
○ and |	⌽	U+233D
○ and ⋆	⍟	U+235F
○ and -	⊖	U+2296
∼ and ∧	⍲	U+2372
∼ and ∨	⍱	U+2371
∼ and ∇	⍫	U+236B
- and /	⌿	U+233F
- and \	⍀	U+2340

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.