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If the line is horizontal, it is the greek letter theta, often used to label an angle.

If the line is diagonal, it is used to denote the diagonal of a circle. As the greek letter phi it is used to denote an empty set and also used to label an angle.

Q: What is a zero with a line through it?

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Izzy and Amie made the zero with a line through it!

How about "is always zero"?

A straight line passes through the x-axis one time, if its slope is non-zero, or not at all, if its slope is zero.

The slope is zero.

A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.

Related questions

Izzy and Amie made the zero with a line through it!

I and A!

How about "is always zero"?

sometimes zero

The letter 'O' with a slash through it is the number zero.

A straight line passes through the x-axis one time, if its slope is non-zero, or not at all, if its slope is zero.

The line going through an "o" helps to clarify the letter o, from the number zero.

The symbol is a zero with a diagonal line through it.

Greenwich, England

zero

The y-axis on a graph is the line that runs up and down through zero. The x-axis is the line that runs horizontally through zero. Both lines help people make their measurements in math.

y = 0. You can get this from the slope-intercept equation of the line.