Question

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Why do we use No in the short form of the number while O does not come in the number.
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Answer 1

Answer:

A high-schooler in Indianapolis, Indiana, wonders why the word number is abbreviated as no. when there's no letter O in the word. The answer lies in the Latin word numero, which is the ablative form of the Latin word for number, numerus

Answer 2

Answer:

When we abbreviate the word “number” as “no.”, where does the “o” come from?

It is for the same reason pound is abbreviated as lb (from Latin lībra) and ounce as oz (from Italian onza).

English borrows a lot of words from other languages. In this case, the abbreviation "no." for the word "number" comes from the numero symbol, № (also written as "No." or "no."), which is in turn derived from Latin numero. As you can see, it has an "o" in it.