Vocagender or Vocaloidgender is a gender directly tied to the Vocaloids that exist as avatars for voicebanks of the Vocaloid software. Being Vocagender/Vocaloidgender means that a person feels that their gender is tied to a Vocaloid/Vocaloids.
Flags
The first flag represents Hatsune Miku, Kasane Teto and Akita Neru. From the Vocaloid song "Triple Baka".