https://www.aamc.org/initiatives/urm/.
In case if the above link does not show correctly, I copied the text from their site below.
Officially only URM is defined and google search for ORM does not lead to any meaningful place. The point which is not clear nor officially defined is related to ORM. Is there any thing like that? In other words, after sorting the pile of URM, the rest is considered equally based on the general admission criteria or the guideline of " relative to their numbers in the general population" is applied for other racial and ethnic groups, for example like Asians. Other words, is there only 2 piles or 3 piles get created of the applicant pool?
AAMC Web Site Info:
Underrepresented in Medicine Definition
On March 19, 2004, the AAMC Executive Committee adopted a clarification to its definition of “underrepresented in medicine” following the Supreme Court’s decision in Grutter.
The AAMC definition of underrepresented in medicine is:
“Underrepresented in medicine means those racial and ethnic populations that are underrepresented in the medical profession relative to their numbers in the general population.”
Adopted by the AAMC’s Executive Council on June 26, 2003, the definition helps medical schools accomplish three important objectives:
a shift in focus from a fixed aggregation of four racial and ethnic groups to a continually evolving underlying reality. The definition accommodates including and removing underrepresented groups on the basis of changing demographics of society and the profession,
a shift in focus from a national perspective to a regional or local perspective on underrepresentation, and
stimulate data collection and reporting on the broad range of racial and ethnic self-descriptions.
Before June 26, 2003, the AAMC used the term “underrepresented minority (URM),” which consisted of Blacks, Mexican-Americans, Native Americans (that is, American Indians, Alaska Natives, and Native Hawaiians), and mainland Puerto Ricans. The AAMC remains committed to ensuring access to medical education and medicine-related careers for individuals from these four historically underrepresented racial/ethnic groups.