Answer:

TAU

Answer	Crossword Clue
TAU	Kind of cross
TAU	Sorority letter
TAU	Cross type

TAU	Greek letter
TAU	Upsilon preceder
TAU	Fraternity letter
TAU	Hellenic T
TAU	It's crossed in Greece
TAU	Sigma's successor
TAU	19th letter of the Greek alphabet
TAU	Symbol for torque

TAU	Letter after sigma
TAU	Cross on a fraternity house
TAU	Greek cross
TAU	Cross shape
TAU	One kind of cross
TAU	Sigma follower
TAU	Greek T
TAU	Sigma's follower

TAU	Hellenic cross
TAU	Fraternity T
TAU	... Kappa Epsilon (fraternity founded in 1899)
TAU	Cretan cross
TAU	Ancient cross
TAU	... Ceti (Sun-like stellar neighbor)
TAU	Torque symbol
TAU	Alpha ... Omega (fraternity founded in 1865)

TAU	Letter before upsilon
TAU	Greek consonant
TAU	Greek "T"
TAU	Frat letter
TAU	Kind of T-shaped cross
TAU	St. Anthony's cross
TAU	Letter from Greece
TAU	Shape of St. Anthony's Cross

TAU	The "T" in the women's fraternity ZTA
TAU	19th Greek letter
TAU	Tee for Zorba?
TAU	Ancient cross shape
TAU	The "T" in some fraternity initials