It's just...i don't remember seeing the term in SL. Nor in the manhwa nor in the novel Natuchipss
Gonna assume SL means what I think it does and wingdings was referenced in there. Towards the end of ch.129 and it's said by Demon King Baran according to the monarch's memories
Solo leveling translators left the name of the font(windings) ina speech bubble ... windings is garbled and symbols So I think dungeon reset translators are making fun of that
What does wingdings mean? ಠ_ಠ