The following ASCII characters are not allowed as e.List item and user names, e.List item and user captions, user logons and user email.
They are also not allowed in dimension names or in namespace names.
Note that these are non-printing characters below ASCII code 32.
| Decimal | Char | Description |
| 0 | NUL | Null |
| 1 | SOH | Start of heading |
| 2 | STX | Start of text |
| 3 | ETX | End of text |
| 4 | EOT | End of transmission |
| 5 | ENQ | Enquiry |
| 6 | ACK | Acknowledge |
| 7 | BEL | Bell |
| 8 | BS | Backspace |
| 9 | TAB | Horizontal tab |
| 10 | LF | NL line feed, new line |
| 11 | VT | Vertical tab |
| 12 | FF | NP form feed, new page |
| 13 | CR | Carriage return |
| 14 | SO | Shift out |
| 15 | SI | Shift in |
| 16 | DLE | Data link escape |
| 17 | DC1 | Device control 1 |
| 18 | DC2 | Device control 2 |
| 19 | DC3 | Device control 3 |
| 20 | DC4 | Device control 4 |
| 21 | NAK | Negative acknowledge |
| 22 | SYN | Synchronous idle |
| 23 | ETB | End of transmission block |
| 24 | CAN | Cancel |
| 25 | EM | End of medium |
| 26 | SUB | Substitute |
| 27 | ESC | Escape |
| 28 | FS | File Separator |
| 29 | GS | Group Separator |
| 30 | RS | Record Separator |
| 31 | US | Unit Separator |
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