O

"?", or "?", is a vowel and a letter in the Estonian alphabet, representing a close-mid back unrounded vowel sound .

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"?" also occurs in the Portuguese language, where it stands for an accented nasalized . It is not an actual letter of the alphabet, but a composition of the letter "O" and the diacritic mark tilde. It is also found in Vietnamese to mark the sound creaky voiced (rising tone with a glottal break followed by a continuation of the rising tone).

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Vowel: In phonetics, a vowel is a sound in spoken language that is characterized by an open configuration of the vocal tract where there is no build-up of air pressure above the glottis, in contrast to consonants, which are characterized by a constriction or closure at one or more points along the vocal tr...

Letter: A letter is a written message from one party to another. Letters are usually intended to be received by someone far away. Before widespread availability of typewriters and computers, letters were always written by hand. Nowadays, letters are only widely used by companies who send out letters to larg...

Estonian alphabet: The Estonian literary language is based on Latin alphabet. The Estonian alphabet consists of 32 letters:...