Differentiating between zero and not sending for OOK

1. How can you tell the difference between 0 and O in handwriting?
2. What is the difference between zero and oh?
3. How do you indicate a zero not an O?
4. Do you put a slash through zero or O?

How can you tell the difference between 0 and O in handwriting?

When it comes to 0 and O, in most fonts, 0 is narrower and O is rounder. I recently heard one teacher help students remember this by saying that 0 is skinnier because it has “zero fat”.

What is the difference between zero and oh?

Both are correct. But, zero is more formal than oh. Native speakers, both Americans and Brits, tend to use either of the forms. Limit the use of oh colloquially.

How do you indicate a zero not an O?

The slashed zero glyph is often used to distinguish the digit "zero" ("0") from the Latin script letter "O" anywhere that the distinction needs emphasis, particularly in encoding systems, scientific and engineering applications, computer programming (such as software development), and telecommunications.

Do you put a slash through zero or O?

The slash is drawn through the zero to distinguish it from the letter 'O'. This stems from the days when programmers wrote their code using pen and paper then sent it to be punched on 80 column cards.