| 2024-03-22 | Lowercase ones look like v's |
| 2024-02-14 | Some Greek letters |
| 2019-05-30 | Greek letters |
| 2018-10-02 | N's in Athens |
| 2018-06-09 | Greek consonants |
| 2017-09-15 | Some college Greeks |
| 2016-01-31 | Fraternity letters |
| 2015-04-05 | Letters in the Greek spelling of "Parthenon" |
| 2015-02-15 | Some fraternity men |
| 2014-10-12 | Neutrinos, symbolically |
| 2014-06-14 | Greek consonants |
| 2013-03-07 | Fraternity letters |
| 2012-11-18 | Lowercase letters resembling v's |
| 2012-02-14 | N N N, to Greeks |
| 2011-12-26 | Letters before xis |
| 2011-01-23 | N N N |
| 2010-12-24 | N N N |
| 2010-11-28 | Preceders of xis |
| 2009-02-10 | Preceders of xis |
| 2008-07-27 | Fraternity letters |
| 2007-03-16 | Some college Greeks |
| 2007-01-07 | Fraternity letters |
| 2006-12-06 | Sweater letters |
| 2006-11-08 | Greek letters |
| 2004-12-05 | Sorority letters |
| 2004-03-23 | College sweater letters |
| 2003-10-26 | Some fraternity men |
| 2002-09-29 | Some fraternity men |
| 2002-04-05 | Symbols for neutrinos |
| 2000-08-06 | Some fraternity men |
| 2000-07-02 | Xi preceders |
| 1999-12-01 | Xis' predecessors |
| 1999-05-07 | Some fraternity men |
| 1997-07-18 | Some fraternity men |
| 1997-03-16 | Fraternity letters |
| 1996-06-09 | Greek consonants |
| 1994-09-29 | Fraternity characters |
| 1994-05-22 | N N N |
| 1993-11-26 | Mus' followers |