How do you tell the difference between O and 0 on a licence plate?

To avoid confusion, the letter O is not used. Only the number zero is used. My state also does not use the letter I for the same reason, they only use the number 1.

The same goes with the VIN on your car.

It's sometimes pretty tough to tell, especially if they have a custom or an out of state plate. It's the same with S and 5 and 1 and I too. You just run it, and if it comes back "no record on computer" you try with the opposite. Usually you can tell it it's a O or a 0 or a 5 or a S on our license plates fairly easily. Our state uses groups of 3 letters and 4 numbers for standard license plates. Something like ABC1234, 1234ABC, or 12ABC34. I usually just look for where the three letters are in this case.

It's a 0. Most States do not use the letter o on their plates.

In North Carolina, letters are on one side, and numbers are on the other.

For example, ABC-1234.

In Britain we use the same symbol for both but its position indicates which it represents. Just another erosion of precision that we have to accept.

There is no o used in license plates or VIN's

I think the 0 has a slash through it

either it has a slash or a dot in the center....in a perfect world.

See -- https://backgroundreports.im/licenseplate