Historical clue formulations

• N.L. East team, on scoreboards — 2026-08-21
• Letter after upsilon — 2026-07-16
• Greek letter that looks like an "O" superimposed with an "I" — 2026-05-05
• ___ Beta Kappa — 2026-04-06
• Greek letter that resembles an "I" atop an "O," as seen eight times in this puzzle — 2026-01-11
• Golden ratio symbol — 2025-12-19
• Aphrodite's second letter — 2025-12-03
• Symbol for electric flux, in physics — 2025-10-11
• Chi preceder — 2025-07-28
• ___ Beta Kappa — 2025-01-14
• The Flyers, on a scoreboard — 2024-08-23
• Apt Greek letter for a University of Pennsylvania fraternity — 2024-05-09
• Preantepenultimate letter — 2023-12-22
• Greek letter used to represent magnetic flux — 2023-12-14
• Flyers, on scoreboards — 2023-11-08
• Golden ratio symbol — 2023-05-25
• The Sixers, on scoreboards — 2022-11-11
• The 76ers, on scoreboards — 2022-10-23
• It's written as a vertical line bisecting a circle — 2022-07-29
• The Eagles, on scoreboards — 2022-06-28
• Letter after upsilon — 2022-05-27
• ___ Beta Kappa — 2022-04-11
• Letter before chi — 2021-12-20
• ___ Beta Kappa — 2021-10-04
• Letter two after tau — 2021-09-19
• Golden ratio symbol — 2021-03-21
• 76ers, on scoreboards — 2020-11-19
• Symbol of the golden ratio — 2020-09-09
• 21st Greek letter — 2020-08-30
• Symbol for the golden ratio — 2020-02-29
• ___ Beta Kappa — 2019-12-25
• Fraternity letter — 2019-01-16
• Upsilon follower — 2019-01-02
• The Eagles, on scoreboards — 2018-08-26
• Golden ratio symbol — 2018-06-02
• Greek letter that represents the golden ratio — 2018-05-01
• #21 of 24 — 2018-01-25
• ___ Beta Kappa — 2017-11-27
• Letter in an honor society's name — 2017-11-01
• Beta preceder — 2017-09-22
• Golden ratio symbol — 2017-09-13
• 21st in a series of 24 — 2017-06-16
• The Eagles, for short — 2017-03-04
• ___ Bete (honor society member, informally) — 2016-12-30
• ___ Beta Kappa — 2016-09-13
• Fraternity letter — 2016-03-16
• Follower of upsilon — 2016-01-24
• One of five rhyming Greek letters — 2016-01-10
• N.L. East team — 2015-12-11
• ___ Beta Kappa — 2015-09-07