special admission category for returnee students
Refers to a special quota or admission track in Japanese schools (often universities) for students who have lived abroad and returned to Japan. The term is commonly used in educational contexts.
She entered university through the special admission category for returnee students.
Please check the application requirements for the returnee student admission category.
帰国子女 means 'returnee children' (those who have lived abroad and returned), while 帰国子女枠 specifically refers to the admission quota or category for such students.
Compound of 帰国 (return to one's country), 子女 (children), and 枠 (frame, quota). The term likely emerged with the increase of Japanese families living abroad and the need for special educational accommodations upon their return.