- PHI
- Sorority letter
- Honor-society letter
- __ Beta Kappa
- Frat letter
- Upsilon follower
- Semper ___ (homonym of the Marine Corps motto, or a rule for what goes in any of this puzzle's special squares)
- Letter before beta?
- Golden ratio letter
- Golden ratio symbol
- Letter before chi
- 76ers, in chyrons
- City where "Silver Linings Playbook" takes place: Abbr.
- Electric flux symbol
- F as in Greece
- Fraternity letter
- It's roughly 1.618
- NFC East team
- NFC East team, in trackers
- Rocky's hometown, for short
- The Golden Ratio
- The golden ratio symbol
- Lincoln Financial Field team, briefly
- Magnetic flux symbol in physics
- Symbol used to measure a roll angle in flight dynamics
- Flyers, on a scoreboard
- Greek letter
- Greek letter that's also a few sports teams on scoreboards
- Greek consonant
- Letter after upsilon
- Sweater letter
- The Sixers' PA home
- The Cyrillic letter "ef" was derived from this letter
- It resembles an ellipse with a capital I bisecting it
- Letter whose capital is vertically symmetric
- Sports team abbr. in all four major U.S. pro sports leagues
- Letter that can sound like either of the first two words of a "giant" chant
- Letter on a key
- Greek F
- Key letter
- ___ Beta Kappa
- College letter
- Letter voiced by a Greek giant?
- 21st Greek letter
- Fraternal letter
- Upsilon's successor
- Upsilon's follower
- Scholastic society letter
- Greek letter that sounds like "f"
- Letter between upsilon and chi
- Symbol representing the golden ratio
- The NFL's Eagles, on a scoreboard
- F in Greek
- Letter one before 28-Down
- Letter in sorority names
- Letter that represents the Golden Ratio
- Preantepenultimate Greek letter
- --Beta Kappa
- Euler's __ function
- __ Bete
- Beta preceder?
- ___ Beat Kappa
- __ Bete: elite society member
- N.L. East team, on scoreboards
- Chi follows it
- Letter from Pharos
- Sixers, on a scoreboard
- Eagles, on scoreboards
- Chi preceder
- Part of PBK
- NYG NFL rival
- Honor society leader?
- 21st of 24
- NBA Sixers, on scoreboards
- Honor society starter
- Gritty's team, on scoreboards
- Greek letter that sounds like "fie"
- Symbol for magnetic flux
- Upsilon neighbor
- Letter from Pericles
- Letter on some gold keys
- Key word
- NL East team
- 21st chapter of a frat
- College key letter
- Eagles, for short
- Ancient excerpt from Aristophanes
- Symbol of the golden ratio
- Fourth-to-last Greek letter
- Greek letter on a key
- Symbol of magnetic flux
- Symbol of latitude
- Symbol used in spherical coordinates
- Follower of upsilon
- Greek letter after upsilon
- Greek letter that represents the golden ratio
- Letter that resembles the "y" of Disney's signature
- With 66-Down, certain honor society member
- Key opener?
- N.L. East champs of '07 and '08
- Next after upsilon.
- It is between upsilon and chi.
- Alpha Delta ___.
- Letter on a frat key.
- Letter on a gold key.
- After upsilon
- Part of a fraternity name
- Letter on a certain key
- Upsilon chaser
- Homophone for fie
- Magnetic flux symbol
- Sorority character
- _____ Beta Kappa
- Campus letter
- Fluidity symbol, in mechanics
- Honor society opening
- Honorary letter
- Letter before Beta in a society's name
- Symbol of electric flux
- ___ phenomenon (optical illusion)
- Honor society character
- 21st letter
- Greek letter associated with the 33-Across
- Greek symbol for the golden ratio
- Fraternity character
- Letter seen twice in Philadelphia
- The Eagles, on a scoreboard
- Greek letter that's also an M.L.B. city on scoreboards
- One of five rhyming Greek letters
- ___ Bete (honor society member, informally)
- 21st in a series of 24
- Letter in an honor society's name
- The Eagles, for short
- #21 of 24
- The Eagles, on scoreboards
- 76ers, on scoreboards
- Symbol for the golden ratio
- Letter two after tau
- Greek letter, or the first three letters of a Pennsylvania city
- It's written as a vertical line bisecting a circle
- The 76ers, on scoreboards
- The Sixers, on scoreboards
- Flyers, on scoreboards
- Greek letter used to represent magnetic flux
- Preantepenultimate letter
- Apt Greek letter for a University of Pennsylvania fraternity
- The Flyers, on a scoreboard
- Chi lead-in
- Greek letter used as a symbol for the golden ratio
- Fie's homophone
- Fraternity letter, perhaps
- ___ Beta Kappa (honor society)
- Fie homophone
- Letter of the Greek alphabet
- Beta Kappa head
- Pa. MLB city
- Greek symbol in the Golden Ratio
- Apt Greek letter for a Penn frat name
- Letter in the Greek (or English!) spelling of "Sphinx"
- Greek fricative
- ____ Beta Kappa
- 14th after 40-Down
- Common fraternity letter
- A sorority letter
- Another fraternity letter
- Letter in some fraternity names
- The Phillies, on scoreboards
- The Flyers or 76ers, on scoreboards
- The Sixers or Eagles, on scoreboards
- Zeta ___ Beta
- City home to Independence Hall (Abbr.)
- The Eagles or Flyers, on scoreboards
- ___ Beta Kappa (academic honor society)
- Greek letter before chi
- Philippians' first letter
- It looks like an omicron and iota superimposed
- ___ Beta Kappa (society begun in 1776)
- ___ Beta Kappa (collegiate honor society)
- Letter on an honor society key
- It looks like an omicron with an iota through it
- Feta was originally spelled with one
- Letter that rhymes with the two that follow it
- Angle symbol
- Letter three before 15-Across
- Greek letter that looks like an I and O superimposed
- It's three after 3-Down
- The Greeks spell "feta" with one
- Greek letter with an "f" sound
