Lingender (shortened to Lin) is an umbrella term for all genders which are androgynous in nature (LIN). It can also be understood as any gender that is simultaneously fingender and mingender. An alternate name is Fimingender (shortened to Fimin), though this isn’t used as widely. It can be used as an umbrella term for any genders that are primarily androgynous. It can also be used as a gender on its own, referring to any gender that may nor be fully defined by being androgynous but is still related to androgyny, or a gender in which androgyny is its defining feature. It's often used by people who cannot narrow down their gender any more than being androgynous.
Since aingender is already used for aporine or sometimes agender in nature, lingender is used. The name allegedly comes from the L that is the first shared letter in the words 'male' and 'female' that isn't already used.