- THETA
- Greek letter
- Iota preceder
- Fraternity letter
- Letter after eta
- Angle symbol
- Letter before iota
- Symbol used for potential temperature in meteorology
- Angle symbol in geometry
- Letter after 60-Across
- Sorority row letter
- Letter from Larissa
- Letter from Crete
- Greek letter used in angles in geometry
- Letter used in plane angles
- Iota's predecessor
- Brain wave of the semiconscious
- First Greek-letter fraternity for women, for short
- Phi Delta ___ (fraternity formed in 1848)
- Greek symbol for plane angles
- Kind of waves often occurring during REM sleep
- It looks like a bisected zero
- Eighth letter of the Greek alphabet
- Sweater letter
- Eighth Greek letter
- Sorority letter
- It comes before iota
- Symbol for an angle in trigonometry
- Greek letter often seen in trigonometry
- Greek letter with a line through its middle
- Iota's preceder
- Angle measurement symbol
- Angle symbol, in trigonometry
- Angle symbol, in trig
- Symbol in geometry
- Certain sorority member
- Frat letter
- 8th Greek letter
- Eta follower
- Campus letter
- Plane angle symbol, in geometry
- Eighth of 24
- Round Greek letter
- It precedes iota
- __ rhythm: brain waves pattern
- Consonant before iota
- Frat row letter
- Plane angle symbol
- Delta Sigma __ sorority
- Trigonometric angle symbol
- Trig symbol
- Letter thought to resemble a skull
- Symbol used in polar coordinates
- Letter preceding iota
- Trigonometry symbol
- Angular letter?
- Geometry class symbol
- Unlucky letter of Greek alphabet.
- Before iota.
- Sorority girl.
- Letter for Homer
- Greek's "unlucky" letter
- Follower of eta
- Letter from Athens
- Thucydides had one
- Eta-iota link
- Eighth in a series
- Head of Thermopylae?
- It's between eta and iota
- Kind of radiation, in science fiction
- Temperature symbol
- Letter before 29-Down
- Certain sorority woman
- Angle denoter, in math
- Oval letter with a line through the middle
- Letter between eta and iota
- Greek letter traditionally associated with Earth Day
- First letter in "Thanatos"
- Letter accompanying sin?
- Letter before 23-Across
- See 22-Across
- Trig angle symbol
- Symbol for a plane angle, in geometry
- Symbol in trigonometry
- Second letter in the Greek for "Athens"
- Letter found between two vowels in the alphabet
- Eighth letter
- Letter in the Greek spelling of Athens
- Symbol for an angle in math
- Frat or trig symbol
- Geometric symbol for an angle
- Platonic character
- Oval with a line in it
- Greek letter that rhymes with the one before it
- Kappa Alpha ___ (first Greek-letter fraternity for women)
- Angle variable
- Iota antecedent
- Eta's follower
- Fraternity letter, perhaps
- Sweater letter, perhaps
- Greek letter or geometric symbol
- Eight letter of the Greek alphabet
- Angle indicator in geometry
- Greek alphabet member
- Greek letter after eta
- Greek's eighth letter
- Greek letter No. 8
- Greeks' 13th letter
- Greek letter for an angle
- Mu Alpha ___ (math honor society)
- Its last three letters are another Greek letter
- Angle symbol, in math
- Greek letter that often represents an angle
- Math symbol for an angle
- Precedes iota
- Eighth letter in a series
- Eta-iota connector
- Phi Delta ___
- Greek letter in geometric angles
- Greek letter resembling a bisected "0"
- Delta Sigma ___ (sorority)
- Iota neighbor
- Earth Day symbol
- Oval letter
- It follows two things that rhyme with it
- Angular measure symbol
- Letter from Thessaly
- Angle symbol, often
- Eighth letter out of 24
- Third letter after epsilon
- Iota follows it
- Letter before 12-Across
- Symbol for death in ancient Athens
