O

Rarity: Common

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What Wikipedia says

O or Oh (majuscule: Օ, minuscule: օ, Armenian: օ) is the 38th letter of the reformed Armenian alphabet and the 37th letter of the classical Armenian alphabet. This letter was first noticed in a text from the year 1046 at the word փափագանօք (p'ap'aganok', longing).

Excerpt from the Wikipedia article “O (Armenian)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Person or Persons Unknown, CC BY-SA 4.0, via Wikimedia Commons.