Historical clue formulations

• Symbolize — 2026-03-12
• Indicate — 2023-04-17
• Mean — 2022-07-30
• Signify — 2021-06-01
• Signal — 2021-01-08
• Indicate — 2019-07-24
• Mark — 2017-02-05
• Mark — 2011-05-29
• Mean — 2009-07-19
• Mean — 2008-10-31
• Signify — 2008-06-30
• Mean — 2007-05-04
• Mean — 2007-03-01
• Mark — 2000-01-14
• Indicate — 1999-10-20
• Mark — 1997-06-29
• Mean — 1997-06-07
• Signify — 1996-02-13
• Signify — 1995-11-15
• Mean — 1994-11-13
• Meaning — 1994-08-28
• Stand for — 1994-06-05
• Signify — 1994-01-09