Historical clue formulations

• It is "an ever-fixed mark that looks on tempests and is never shaken," per Shakespeare — 2025-10-07
• What crossing your hands in front of your chest means in American Sign Language — 2025-04-11
• Emotion indicated by the emoticon <3 — 2023-12-13
• Common sign-off in a letter — 2023-10-30
• Either blank in "___ is ___" — 2023-09-17
• A battlefield, per Pat Benatar — 2023-06-07
• It means nothing at Wimbledon — 2022-12-21
• Word with bird or nest — 2022-11-03
• Zero, in tennis — 2022-09-19
• The "heart" of "I [heart] N Y" — 2022-01-26
• It's nada to Nadal — 2021-10-24
• Domain of Venus and Aphrodite — 2021-03-09
• Letter sign-off — 2021-03-03
• Score before 15, in tennis — 2020-11-16
• Classic pop art sculpture with a slanted "O" — 2020-09-13
• What a lock on a bridge can symbolize — 2020-09-04
• Zero — 2019-04-27
• It "keeps the cold out better than a cloak," per Longfellow — 2017-11-21
• Dearest — 2016-09-10
• Zero, at Ashe Stadium — 2016-08-31
• Letter sign-off — 2016-04-17
• Valentine's feeling — 2015-02-09
• Treasure — 2013-12-14
• Starting score in tennis — 2013-10-15
• "A temporary insanity," per Ambrose Bierce — 2013-07-09
• "___ is composed of a single soul inhabiting two bodies": Aristotle — 2013-03-05
• Romance — 2013-01-01
• "The occupation of the idle man, the distraction of the warrior, the peril of the sovereign," per Napoleon — 2012-02-22
• *Valentine sentiment — 2012-02-01
• It means nothing — 2011-10-28
• Sonnet subject — 2011-03-09
• Troubadour's subject — 2010-06-27
• Serenader's subject — 2010-02-03
• Zero, in tennis — 2009-06-22
• It is "resistless in battle," wrote Sophocles — 2008-07-04
• Aphrodite's domain — 2007-12-11
• All you need, in a Beatles song — 2007-07-04
• Something often fallen out of — 2007-02-16
• It's nothing — 2007-02-04
• XOXOXO alternative — 2006-10-05
• Zero — 2006-05-21
• All you need, to the Beatles — 2006-05-16
• All you need, according to the Beatles — 2006-05-02
• With 21-Across, heartsick — 2006-02-20
• Motherly instinct — 2004-12-02
• Valentine subject — 2004-11-08
• Score of zero — 2004-10-24
• Serenader's sentiment — 2004-08-27
• ___-all (score) — 2004-07-13
• Zero, on a court — 2004-02-10