| 2026-08-23 | Angle variable in geometry |
| 2026-08-17 | Greek letter that symbolizes an angle |
| 2026-05-01 | Angle variable, in math |
| 2026-01-13 | Angle symbol, in geometry |
| 2025-03-01 | Variable representing an angle, in math |
| 2024-12-22 | Letter before iota |
| 2023-10-12 | Angle symbol, in trigonometry |
| 2023-02-23 | Symbol for an angle in math |
| 2022-01-10 | Letter before iota |
| 2022-01-07 | Letter in the Greek spelling of Athens |
| 2021-11-21 | Sorority letter |
| 2021-08-07 | Certain sorority member |
| 2021-02-14 | Eighth letter |
| 2020-05-24 | Thucydides had one |
| 2020-01-20 | Letter before iota |
| 2019-09-29 | Angle symbol in geometry |
| 2019-07-12 | Letter found between two vowels in the alphabet |
| 2018-01-30 | Iota preceder |
| 2018-01-07 | Second letter in the Greek for "Athens" |
| 2017-09-22 | Symbol for a plane angle, in geometry |
| 2017-05-21 | Symbol in trigonometry |
| 2016-07-24 | Trig angle symbol |
| 2015-11-03 | Letter before 23-Across |
| 2015-09-17 | First letter in "Thanatos" |
| 2015-09-16 | See 22-Across |
| 2015-07-03 | Letter accompanying sin? |
| 2015-01-24 | Certain sorority member |
| 2014-03-25 | Certain sorority woman |
| 2013-11-05 | Greek letter traditionally associated with Earth Day |
| 2013-01-20 | Certain sorority woman |
| 2012-08-13 | Letter before iota |
| 2011-10-10 | Letter after eta |
| 2011-09-28 | Angle symbol, in trigonometry |
| 2010-12-15 | Angle symbol, in trigonometry |
| 2008-10-14 | Letter before iota |
| 2008-07-22 | Letter between eta and iota |
| 2008-04-10 | Sorority letter |
| 2008-03-06 | Fraternity letter |
| 2006-05-03 | Sorority letter |
| 2006-03-19 | Angle denoter, in math |
| 2006-02-21 | Oval letter with a line through the middle |
| 2004-11-21 | Certain sorority member |
| 2003-01-01 | Certain sorority woman |
| 2002-10-25 | Angle measurement symbol |
| 2002-05-06 | Letter before iota |
| 2002-03-04 | Letter before 29-Down |
| 2001-07-02 | Sorority letter |
| 2000-12-03 | Temperature symbol |
| 1999-11-25 | Fraternity letter |
| 1999-10-25 | Iota preceder |
| 1999-07-04 | Kind of radiation, in science fiction |
| 1998-10-27 | Angle symbol |
| 1997-11-24 | Eta follower |
| 1997-01-29 | It's between eta and iota |
| 1996-12-29 | Head of Thermopylae? |
| 1996-08-08 | Eighth in a series |
| 1995-12-20 | Eta-iota link |