If you mean what does an o with a line over it means, it means that there is emphasis on the o. Such as, Rōb would be pronounced like Robe, not Rob. If you mean how to type it, I just searched what is an o with a line over it? in Google, then copy and pasted it onto my document. Hope this helped.
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The diameter.
Uppercase: B, C, D, E, H, I, K, O, and X Lowercase: c, k, l, o, and x
Look at the following diagram - The O represents a counter - the dots are just for spacing. OOOOOO O...........O O...........O O...........O O...........O OOOOOO
periodic line
If there is a line over a decimal, it means the decimal is repetitive. If you are typing it would look like this... .7