A "Rho Chi" is a sorority member who serves as a "Recruitment Counselor to PNMs during recruitment. She disaffiliates herself from her sorority for a given amount of time so that she can be a fair and unbiased resource for the PNMs. Her affiliation is revealed at the conclusion of recruitment.

They were called Rho Chis for years before it was discovered that "Rho Chi" was already being used by another organization. I've seen them called Rho Gammas, Pi Chis, Sigma Gammas, etc. on different campuses.