Wushu Tao
(https://www.wushu-tao.com)

Writing sheet of the characters :

• sān jiāo 三焦 (Triple réchauffeur)

                                                                                                                                                                                                                                    
For more informations about these characters and their pronunciations, consult this page :
https://www.wushu-tao.com/page_ac_liste_car.php