The symbol is 
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It’s the music symbol for "Dal Segno" —’from the sign’—the sign put at the beginning of the first portion.
>Solution :
Copy-and-paste from Wikipedia, it’s 𝄋 – in Unicode it’s MUSICAL SYMBOL SEGNO – code-point U+1D10B – documented here: https://www.unicode.org/charts/PDF/U1D100.pdf
