Referring Clues

• Frat letter
• See 10-Across
• Christogram letter
• Density symbol
• P, in Greece
• Fraternity letter
• Pi follower
• Letter after pi
• Sorority letter
• Letter before sigma
• Greek consonant
• Density symbol, in mechanics
• Letter on some college jackets
• Sweater letter
• Pi's follower
• P, on a fraternity jacket
• Sorority chapter
• Christogram component
• 17th chapter
• P on a fraternity house
• P, on a fraternity sweater
• When tripled, a crew member's fraternity?
• When said three times, a crew member's fraternity?
• Chi ___ (religious symbol)
• Density symbol, in physics
• P
• Fraternity character
• P, to Plato
• Letter between pi and sigma
• Letter from the Corinthians
• Symbol for density
• Fraternity P
• The "r" in Aristotle
• Pythagorean character
• Sigma preceder
• P, on a fraternity house
• Corinthian letter
• P, in the Greek alphabet
• Pythagorean P
• Campus letter
• Peloponnesian P
• Letter from Greece
• Greek letter
• Pi-sigma go-between
• Plato's "P"
• Letter that may be used by 61-Down
• 17th Greek letter
• P at the Parthenon
• P, to Pythagoras
• "P" on fraternity row
• P-shaped Greek letter
• Greek P
• P, to the Greeks
• Greek euro letter
• Letter in Socrates' name
• Sigma follows it
• First letter in the last third of the Greek alphabet
• See 16-Across
• Reflectance symbol
• P that's two before T
• Letter on some campus sweatshirts
• Letter that follows pi
• Pi-sigma connection
• 17th letter of the Greek alphabet
• P, to Pericles
• Plato's P
• Greek letter used in spherical coordinates
• Letter used as a density symbol
• P lookalike
• Pi-sigma link
• Greek character
• Greek letter that looks like a "P"
• P-like Greek letter
• Air density symbol
• Frat-house letter
• Hellenic P
• P as in physics
• 50 Across preceder
• Sigma neighbor
• Christogram component, sometimes
• Symbol of density
• Aristotle's P
• Christogram component, perhaps
• It's after pi
• Pi's successor
• Frat letter, perhaps
• Letter shaped like a P
• Pi Sigma separator
• P in the Parthenon
• Letter on some euros
• P, to Socrates
• When written three times, fraternity in "Revenge of the Nerds"
• P, to Greeks
• P-like letter
• P on fraternity row
• Seventeenth Greek letter
• Greek letter whose capital looks like a P
• Euripides character?
• Fraternity chapter #17
• A fraternity chapter
• Letter from Corinthians
• "P" as in Ptolemy
• P, on some sweaters
• Fraternity letter
• P for Pythagoras
• It's between pi and sigma
• Sorority letter
• Letter after pi
• Platonic P
• P look-alike
• It follows pi
• One-third of a Greek boating fraternity?
• Fraternity "P"
• Air-density symbol
• Pythagoras's P
• 55-Down letter
• Hector's end?
• Secondary character in Aristophanes?
• P look alike
• Greek letter after pi
• Sigma's predecessor
• Another fraternity letter
• Greek letter that sounds like the end of 16-, 22-, 36-, 47- or 58-Across
• See 51-Down
• Pi neighbor
• Frat row letter
• P on campus
• Symbol of mass density
• Fraternity chapter
• Certain sorority chapter
• Part of the Greek alphabet
• 40-Across follower
• Greek letter "r"
• Mass-over-volume symbol
• Follower of pi
• Greek "P"
• P, on campus
• Chi-___ (Christian symbol)
• Seventeenth letter of the Greek alphabet
• Greek alphabet's 17th letter
• P on a frat pin
• P in Greece
• Symbol of charge density
• Second letter before 7-Down
• Certain fraternity chapter
• Aristotle character
• P pronounced like an R
• Greek "r"
• Letter that sounds like a swath of seats
• P on a frat house
• Sorority character
• Chi-___ (religious symbol)
• Hellenic letter
• Serving after pi?
• P, on fraternity row
• A Greek letter
• It comes after pi
• P, in a 63-Across
• P's look-alike
• Character from Aristophanes?
• Resistivity symbol
• P in Peloponnesus
• Letter in the Hammett equation
• P, to Plutarch
• Chi-___ (military insignia for Constantine the Great)
• Letter used with theta and phi to represent spherical coordinates
• Greek letter in an early Christogram
• Warhol's letter from Greece?
• Letter from Greece from air hostess
• Another Greek alphabet
• "P" of the Greeks
• When said three times, good name for a crew fraternity?
• P, in Greek
• Frat house P
• Greek character in starter home
• P, in a fraternity name
• P, for Plato
• Homophone of "row"
• Letter from Homer
• Letter resembling a P
• Pi 1?
• Parthenon P
• Socrates' P
• P, to Persephone
• P two before T
• Part of the original spelling of "Sparta"
• Fraternity letter that's a homophone of where fraternities might be found
• Greek letter that sounds like part of a spreadsheet
• Letter that looks like a P
• P, to Penelope
• P, as for Plato
• Greek letter that sounds like a verb
• Homophone of "roe"
• Part of the Greek spelling of "Aristotle"
• It looks like a "P" but sounds like an "R"
• Density symbol borrowed from the Greek alphabet
• See 118-Down
• P, in a sorority name
• Letter seen in a Christogram
• Only Greek letter ending in "o"
• Greek letter that resembles a P
• Greek letter that sounds like "row"
• The letter after pi
• Greek letter that sounds like 63-Down
• Fraternity row letter with a homophone in this clue
• Pi follower in the Greek alphabet
• Sigma Gamma ___ (historically Black sorority)
• Frat row letter that's a homophone of "row"
• Euripidean P
• Corinthian character
• Sorority row letter
• Greek letter that looks like "p"
• Letter in Socrates' and Aristotle's names