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وطبيب ذاك العالم الرباني
Null and zero are not equivalent in programming. Null is the absence of a value, while zero *is* a definite value.
Null comes from Latin 'nullius' = 'ne'->"no" + 'ullus'->"any", so 'nullus' = "none" or literally "no anything."
This is confusing in Norwegian, where null *means* zero.