That would be every decimal number from .001 to 999, truncated to 3 digits.
If you don't mind sticking to whole numbers, it's every counting number
from 100 to 999. There are 900 of those.
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There are 9000 4-digit numbers in hindu-arabic numeration system
81
In the base-10 system, the 4-digit whole numbers are every number from 1,000 to 9,999. That's 9,000 numbers. If decimals are included, there are a lot more. For example, from .0001 to .9999 alone, there are over 9,000 more.
Not counting numbers with leading 0s, there are 48 = 44 - 43
9000