hbd = human biodiversity: the diversity found among and between human populations that has a biological basis.
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here’s a mash-up of half sigma’s defintion plus some tweaks from me:

Human Biological Diversity (HBD): The acknowledgement and study of how humans differ from each other on both the individual and group levels due to variations between individual genotypes as well as average differences between population genotypes, the differences resulting via evolutionary processes. These differences include, but are not limited to, personality traits, athletic ability, intelligence, height, health, and physical appearance.

also: HBD research draws on genetics as well as social, historic, and prehistoric data on human populations.

more from steve sailer (who coined the term): what is hbd?