Fulmian

Fulmian is a xenogender from the element system. It is a combination of the masculine element fervian (fire), and the undefined element ventulian (air). It is represented by the element of lightning.

History
Fulmian was first known to be coined on January 14th, 2018, along with the flag, but it was likely coined earlier than that on a Google spreadsheet.

Flag
The flag's colors are yellow, grey and black, the colors of lightning in a storm, with a diamond in the center, representing the fervian and ventulian triangles stuck together.

Etymology
The word fulmian comes from the Latin word fulmen, meaning "lightning".