Historical clue formulations

• Inflation measures, for short — 2026-01-21
• Letters before omegas — 2026-01-19
• Trident-shaped letters — 2026-01-14
• Pitchfork-shaped letters — 2025-07-06
• Pitchfork-shaped letters — 2025-01-08
• Trident-shaped Greek letters — 2022-10-24
• Symbols of wave functions — 2022-07-03
• Pitchfork-shaped letters — 2021-05-16
• Electric flux symbols — 2020-07-26
• Sorority letters — 2018-10-20
• Symbols of wave functions — 2018-08-18
• Trident-shaped letters — 2018-03-07
• Letters between chis and omegas — 2016-01-04
• Penultimate letters — 2015-04-04
• Trident-shaped letters — 2014-07-27
• Greek letters resembling tridents — 2013-11-25
• Wave function symbols — 2013-07-27
• Greek consonants — 2013-04-11
• Electric flux symbols — 2013-02-22
• Fraternity letters — 2012-12-05
• Next-to-last Greek letters — 2012-08-29
• Fraternity letters — 2012-03-21
• Pitchfork-shaped letters — 2011-12-06
• Fraternity characters — 2011-11-10
• Letters before omegas — 2011-09-12
• Pitchfork-shaped letters — 2011-05-30
• Fraternity characters — 2011-04-16
• Letters after chis — 2010-08-23
• Fraternity letters — 2008-11-23
• Greek letters that resemble pitchforks — 2008-09-01
• Greek letters that look like pitchforks — 2008-07-01
• Fraternity letters — 2007-12-30
• Characters in a frat house? — 2007-02-22
• Pitchfork-shaped letters — 2006-12-20
• Greek letters — 2006-11-24
• Trident-shaped letters — 2006-10-31
• Pitchfork-shaped letters — 2006-08-01
• They're trident-shaped — 2006-07-23
• Penultimate letters — 2006-04-07
• Trident-shaped letters — 2006-03-22
• Electric flux symbols — 2006-01-08
• Trident-shaped letters — 2005-10-09
• Trident-shaped letters — 2005-09-20
• Particle flux density symbols — 2005-01-20
• They're pitchfork-shaped — 2004-12-24
• Trident-shaped letters — 2004-02-17
• They're trident-shaped — 2003-06-21
• They're trident-shaped — 2002-04-20
• They're painted on some frat houses — 2001-05-12
• Trident-shaped symbols — 2001-02-25