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Double bottom rule
(lemmy.blahaj.zone)
A diagram of a "bottom meson" (composed of an unknown quark "q" and an antibottom quark) with an arrow labeled ":3" pointing to a "double bottom Baryon" (composed of an unknown quark "q" and 2 bottom quarks).
Image taken from figure 1 of this article
Big Bottom Barry makes my rockin' world go 'round.