Historical clue formulations

• They're found beside exclamation marks on keyboards — 2023-12-03
• Little waves, in Spain — 2020-11-19
• Marks gotten in Spanish class? — 2014-10-19
• Spanish diacritical marks — 2014-04-21
• They're found in año after año — 2011-01-23
• Tiny waves — 2006-09-16
• Marks in Spanish class — 2004-07-18
• Marks in Spanish class — 2003-04-19
• Squiggly marks — 2002-06-10
• Spanish letter addenda? — 2001-07-12
• Marks over n's — 1998-04-14