Answer:

rhos

Answer	Crossword Clue
RHOS	Greek letters
RHOS	Sorority letters
RHOS	Pis' followers

RHOS	Ps in Greek
RHOS	Plato's P's
RHOS	P's, to Plato
RHOS	Frat letters
RHOS	P's, to Pythagoras
RHOS	P's on sorority sweaters
RHOS	Greek P's
RHOS	P's on frat jackets

RHOS	Greek characters
RHOS	Pi followers
RHOS	Density symbols, in physics
RHOS	Letters after pi
RHOS	Sigma preceders
RHOS	Campus letters
RHOS	P-like Greek letters
RHOS	They follow pis

RHOS	"100" symbols, in Greek numerals
RHOS	Letters after pis
RHOS	P-like letters
RHOS	Frat jacket P's
RHOS	Fraternity letters
RHOS	Brotherly letters on campus
RHOS	Greek consonants
RHOS	Sweater letters

RHOS	P's in the Parthenon
RHOS	P's pronounced like R's
RHOS	Some frat consonants
RHOS	Symbols of density
RHOS	Fraternity characters
RHOS	Letters from Greece
RHOS	Letters before sigmas
RHOS	Followers of pis

RHOS	Pythagorean Ps
RHOS	P P P
RHOS	P look-alikes
RHOS	Symbols for reflectivity or resistivity
RHOS	Chi-... (Christian monograms)