Can someone explain the significance of the 8-pointed star in ACOSF to me??? It seems to be Nessian’s symbol...but idk if I’m missing something even bigger. Thanks in advance!

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Can someone explain the significance of the 8-pointed star in ACOSF to me??? It seems to be Nessian’s symbol...but idk if I’m missing something even bigger. Thanks in advance!
CANT EFFING CONTAIN MY EXCITEMENT
Nesta and Cassian Fluff
Nesta: what do you want you buffoon?!
Cassian: only to tell you your butt looks nice today
Nesta: you bastard my butt looks good everyday!
Cassian: ...oh great Nesta, your ass is like two round plump apples.
Nesta: asshole! You think I'm fat!!!
Cassian: ...