Historical clue formulations

• Tagging symbols — 2026-04-08
• Parts of many online handles — 2026-01-04
• @ @ @ — 2025-11-30
• Mentions directly, on X — 2025-11-10
• Email signs — 2025-02-12
• They share keys with 2's — 2025-01-18
• @@@ — 2024-11-27
• Social media symbols — 2024-04-14
• @@@ — 2023-10-31
• Symbols in social media handles — 2023-10-15
• @ @ @ — 2023-07-11
• Symbols for tagging on Twitter — 2023-05-02
• Email symbols, informally — 2022-11-13
• Symbols used for tagging — 2022-09-01
• Symbols in Twitter handles — 2021-01-24
• Contact information symbols, nowadays — 2020-05-15
• Symbols seen in comic strip cursing — 2019-08-24
• @@@ — 2018-07-17
• Much-used Twitter symbols — 2018-04-03
• @@@ — 2017-02-26
• @@@ — 2016-07-05
• @@@ — 2015-09-27
• @ @ @ — 2015-05-01
• Cadillac model that debuted in 2012 — 2015-02-06
• Cadillac model unveiled in 2012 — 2012-08-15
• Symbols like @ — 2009-10-18
• Some PC's — 1994-07-03