Thistlian refers to someone who is agender or genderless with attraction to men. A similar term is agenilian, and the feminine equivalent is azalian.
History
The term was coined by Tumblr user Genderless-Gibberish on July 9, 2018.[1] It's named after the thistle flower.
Flag
The flag was designed by Tumblr user Nooonbinaryyyy on July 9, 2018.[2] The first three stripes come from the colors of the thistle flower. The white stripe represents the absence of gender. And the green comes from the agender flag.