The most commonly used squidgender flag
Squidgender is a faunagender defined as "a gender that is definitely there, but once you take time to examine it and work out what it is, it becomes obscure and sometimes disappears for a while, similar to that of a squid hiding itself in a cloud of ink.
Squidgender was coined on July 18, 2014 by tumblr user runagays (or branacle). The flag was created on April 15, 2018 by tumblr user love-all-around1223.