Section 504 refers to Section 504 of the Rehabilitation Act and the Americans with Disabilities Act which specifies that no one with a disability can be excluded from participating in federally funded programs or activities, including elementary, secondary or postsecondary schooling.
Section 504 is administered by the Office of Civil Rights, not by the Special Education Division. Please see the document below, published by the U.S. Department of Education, and the OPI Civil Rights & Legal Topics Page for more information and resources.
Parent and Educator Resource Guide to Section 504 in Public Elementary and Secondary Schools