ISO-IR-68
ISO-IR-68 is a character set developed by the Canadian Standards Association, and registered for use in ISO character set designation mechanisms. It is used to represent the symbols used by the APL programming language.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:
| Combined characters | Composite character | 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 |
