It’s because the pronunciation is technically a ‘y’ sound, and even though y is sometimes considered a vowel, ‘an’ is not used in front of words that start with the ‘y’ sound.
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It's telling the theatre to be quiet.
Answer:
Avicenna was born near Bukhara, which at the time was ruled by Samanid dynasty. His father was a government official and his home served as a meeting place for men of learning. Avicenna had educated teachers while growing up.
