What is the name of Gojo’s cursed technique? 

Which ten shadow shikigami is this hand sign responsible for?

The ability to single-handedly overthrow a country

The ability to single-handedly overthrow the three great families

A very rare and powerful cursed technique 

The death of all culling game players aside from Geto, Megumi, and Himi

The death of all culling game players aside from Geto and Megumi

The death of all culling game players aside from Geto, Megumi, and Yuji

Gege talks about this in the Jujutsu Kaisen Official Fanbook

The scars are a part of his cursed technique

The questions on here are as of chapter 258 of the JJK manga.