I thought it's going to be mojibake, but it's not of the � variety, just a regular question mark. One candidate is the "precedes" symbol: https://codepoints.net

I thought it's going to be mojibake, but it's not of the � variety, just a regular question mark. One candidate is the "precedes" symbol: https://codepoints.net/U+227A https://codepoints.net/U+227A