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- The [snvalid()](https://help.autodesk.com/view/ACD/2016/ENU/?guid=GUID-2EFBE198-9860-456B-A090-206C743ACB90) [[AutoLISP]] function checks the symbol table name for valid characters.
- Symbol tables names are layer- linetype-, style names ...
- Characters disallowed in symbol table names:
- `< >` less-than and greater-than symbol
- `/\` forward slash and backslash
- `"` quotation mark
- `:` colon
- `?` question mark
- `*` asterisk
- `|`vertical bar
- `,` comma
- `=` equal sign
- `` ` `` backquote
- `;` semicolon (ASCII 59)
- Known exceptions, used by [[AutoCAD]] for internal usage:
- `*ADSK_...`
- `*ACMAP`
- `*TEMPORARY`
- The `*` as first and **only** as first letter seems to be accepted by [[AutoCAD]]
- `*XYZ` is OK
- `XYZ*` is not OK
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