What do `ns` and `us` stand for in `timeit` result?

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I was trying to compare performance of two statements with timeit, and the results are something like:

 100 loops, best of 3: 100 ns per loop
 100 loops, best of 3: 1.96 us per loop

But I don't know what these ns and us stands for, so I don't know which one is faster.

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