Os

Os is the vowel “o”

Anglo-Saxon Rune Poem (from ragweedforge.com)

The mouth is the source of all language,
a pillar of wisdom and a comfort to wise men,a blessing and a joy to every knight
Os is the rune for today, signifying a day of communication, speech, song, language, and expression. What you hear and say is going to have impact today, so be open and listen as much as you talk. You might find yourself being wittier or more eloquent, able to get your meaning across easier, but you could just as well find yourself bombarded with messages, phone calls, emails and other forms of communication media