Historical clue formulations

• Old English letter — 2018-02-11
• Icelandic letter — 2017-09-24
• Old English letter — 2015-10-09
• Old English letter — 2004-06-27
• Old letter — 2003-09-19
• Old letter — 2003-07-06
• Phonetic alphabet symbol for "th" as in "the" — 2003-03-28
• Letter in runes — 2000-04-07
• Old English letter — 1998-09-10
• Old English letter — 1997-04-18
• Old English letter — 1997-03-16
• Old English letter — 1995-10-24