I'd say, uncountable.
I raise cattle. I have 300 head of cattle. (That's... what's the word? Metonymy? You say "head" for the whole body.)
My knowledge is based on American Westerns, so I really welcome input from someone who knows this for real.
I think it's pars pro toto, a kind of synecdoche which is a kind of metonymy. ;-)I raise cattle. I have 300 head of cattle. (That's... what's the word? Metonymy? You say "head" for the whole body.)
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