Phosblackflashial

 is a gender in the Phosial System that may feel as if it is in, or lit by light from black flash from Jujutsu Kaisen. It may also be used with other gendered suffixes or subtypes.

Etymology
The term uses the prefix "phos", indicating that is it in the Phosial System, followed by "blackflash", and the suffix "-ial".

Definitions

 * a gender that is lit by black flash from jujutsu kaisen. the kanji is that used in the manga in this panel. - Epikulupu, 2022

History
Phosblackflashial was coined on the Tumblr blog Epikulupu on March 1st, 2022.

Flags
The symbol on the flag is the kanji "黒閃" that is used in the Jujutsu Kaisen manga.