How about ONE!
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In mathematics, the number zero (0) is the only number that begins with the letter "o." Zero is a unique number that represents the absence of quantity or value. It serves as the additive identity, meaning that when added to any number, the sum remains unchanged.
Oh, what a happy little question! The number that begins with the letter "o" is zero. It's a quiet and peaceful number, just waiting to be painted onto the canvas of mathematics.
The number one begins with o. One hundred, one thousand, etc. also begin with the letter o.