oe number

Œ (minuscule: œ) is a Latin alphabet grapheme, a ligature of o and e. In medieval and early modern Latin, it was used in borrowings from Greek that originally contained the diphthong οι, and in a few non-Greek words. These usages continue in English and French. In French, the words that were borrowed from Latin and contained the Latin diphthong written as œ now generally have é or è; but œ is still used in some non-learned French words, representing mid-front rounded vowel-sounds, such as œil ("eye") and sœur ("sister").
It is used in the modern orthography for Old West Norse and is used in the International Phonetic Alphabet to represent the open-mid front rounded vowel. In English runology, œ ɶ is used to transliterate the Runic letter odal (Old English ēðel "estate, ancestral home"). Its traditional name in English is ethel or œthel (also spelt, ēðel, odal).

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