“special characters” doesn’t have a defined meaning that I am aware of. So it depends on what you mean by “special”.
Example OK special: ~#%.$
Example not OK special: ℵπ😮à
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“special characters” doesn’t have a defined meaning that I am aware of. So it depends on what you mean by “special”.
Example OK special: ~#%.$
Example not OK special: ℵπ😮à