I think for most people, they would encounter it in a science class early in life (at least for English speakers). And Hg is just the chemical symbol for mercur

I think for most people, they would encounter it in a science class early in life (at least for English speakers). And Hg is just the chemical symbol for mercury, https://pubchem.ncbi.nlm.nih.gov/element/Mercury#section=Identifiers https://pubchem.ncbi.nlm.nih.gov/element/Mercury#section=Ide...