It means that the survey had zero India/China born developers in its sample. The page links to https://usa.ipums.org/usa/sampdesc.shtml#us2017a which states that the AMERICAN COMMUNITY SURVEY 2017 SAMPLE is a "1-in-100 national random sample of the population." Hence, the estimate of 877 software developers in Wyoming (WY) likely comes from a sample of 9 with 6 being U.S. born and 3 being born in a foreign country other than India or China. That's why the counts are usually limited to a minimum of 1,000 and are usually much higher.
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