Does millionth have a commonly used sign like % (percentage)?

Question

Does millionth have a commonly used sign like % (percentage)? I tried to check wikipedia, but not found anything.

Answer 1

When describing millionths of something, we add "ppm" (which stands for parts per million) at the end of a quantity to say that it is in millionths. For example, 0.1% is equivalent to 1000ppm or 0.001.