∽

Reverse sim (U+223D), rarely used but similarly denotes proportionality;

⁓

Swung dash (U+2053);

〜

Wave dash (U+301C);

〰

Wavy dash (U+3030);

～

Full-width tilde (U+FF5E);

⸛

Tilde with a ring above it (U+2E1B);

⸞

Tilde with a dot above it (U+2E1E);

⸟

Tilde with a dot below it (U+2E1F);

﹋

Wavy overline (U+FE4B);

՜

Armenian exclamation mark (U+055C);

Caveat: characters can differ in appearance vastly with different fonts. Using the semantically correct character might not always look the best.