Wushu Tao
(https://wushu-tao.com)
Writing sheet of the characters : - huì yīn 会阴 (Le périnée (point d'acupuncture situé à mi distance entre l'anus et le scrotum))
   
For more informations about these characters and their pronunciations, consult this page :
https://wushu-tao.com/page_ac_liste_car.php