Quick answer
Superscript 1, 2, and 3 are the only superscript characters in the Latin-1 range and so the only ones with a real legacy Alt code; every other superscript digit or letter needs the universal hex method.
01 Alt codes at a glance
| Character | Windows Alt code | Universal (any codepoint) | Mac | HTML |
|---|---|---|---|---|
| Superscript Left Parenthesis | — none — | Alt+X after typing 207D (Word) · Ctrl+Shift+U then 207d (Linux) |
Character page → | |
| Superscript Right Parenthesis | — none — | Alt+X after typing 207E (Word) · Ctrl+Shift+U then 207e (Linux) |
Character page → | |
| Superscript Plus Sign | — none — | Alt+X after typing 207A (Word) · Ctrl+Shift+U then 207a (Linux) |
Character page → | |
| Superscript Equals Sign | — none — | Alt+X after typing 207C (Word) · Ctrl+Shift+U then 207c (Linux) |
Character page → | |
| Superscript Minus | — none — | Alt+X after typing 207B (Word) · Ctrl+Shift+U then 207b (Linux) |
Character page → | |
| Superscript Zero | — none — | Alt+X after typing 2070 (Word) · Ctrl+Shift+U then 2070 (Linux) |
Character page → | |
| Superscript Four | — none — | Alt+X after typing 2074 (Word) · Ctrl+Shift+U then 2074 (Linux) |
Character page → | |
| Superscript Five | — none — | Alt+X after typing 2075 (Word) · Ctrl+Shift+U then 2075 (Linux) |
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| Superscript Six | — none — | Alt+X after typing 2076 (Word) · Ctrl+Shift+U then 2076 (Linux) |
Character page → | |
| Superscript Seven | — none — | Alt+X after typing 2077 (Word) · Ctrl+Shift+U then 2077 (Linux) |
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| Superscript Eight | — none — | Alt+X after typing 2078 (Word) · Ctrl+Shift+U then 2078 (Linux) |
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| Superscript Nine | — none — | Alt+X after typing 2079 (Word) · Ctrl+Shift+U then 2079 (Linux) |
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| Superscript Latin Small Letter I | — none — | Alt+X after typing 2071 (Word) · Ctrl+Shift+U then 2071 (Linux) |
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| Superscript Latin Small Letter N | — none — | Alt+X after typing 207F (Word) · Ctrl+Shift+U then 207f (Linux) |
Character page → |
0 of 14 characters here have a legacy Windows Alt+NNNN code — that code only exists for the Latin-1 Supplement range and Windows-1252's fixed special-character block, not for Unicode generally. Every character has the universal hex-based method though: type the hex codepoint, then press Alt+X in Word to convert it.
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