Today's Rune: ᚪ called Ác is transliterated as "a", meaning "oak" from Old English.
The Anglo-Saxon futhorc split the Elder Futhark a rune (ᚨ) into three independent runes due to the development of the vowel system in Anglo-Frisian. These three runes are ōs ᚩ (transliterated o), āc "oak" ᚪ (transliterated a), and æsc ᚫ "ash" (transliterated æ).