Author font family: normal normal 14px Arial, Tahoma, Helvetica, FreeSans, sans-serif;

News YC font-family: Verdana, Geneva, sans-serif;

Per https://unicode.scarfboy.com/ these are the characters (formatting issues are expected):

U+03B8 θ GREEK SMALL LETTER THETA

U+2713 CHECK MARK

U+203E ‾ OVERLINE

U+2191 ↑ UPWARDS ARROW

U+2193 ↓ DOWNWARDS ARROW

U+007E ~ TILDE

U+03B1 α GREEK SMALL LETTER ALPHA

U+03B2 β GREEK SMALL LETTER BETA

U+0394 Δ GREEK CAPITAL LETTER DELTA

U+03D5 ϕ GREEK PHI SYMBOL

Specific characters that aren't showing up:

U+2713 CHECK MARK, U+203E ‾ OVERLINE, U+2191 ↑ UPWARDS ARROW, U+2193 ↓ DOWNWARDS ARROW, U+03D5 ϕ GREEK PHI SYMBOL

Arial contains most of these, Verdana does not. That's the limit of my knowledge of webified things.