  Strangeon is proposed to be the constituent of bulk strong matter, as an
analogy of nucleon for an atomic nucleus. The nature of both nucleon matter (2
quark flavors, u and d) and strangeon matter (3 flavors, u, d and s) is
controlled by the strong-force, but the baryon number of the former is much
smaller than that of the latter, to be separated by a critical number of
$A_{\rm c}\sim 10^9$. While micro nucleon matter (i.e., nuclei) is focused by
nuclear physicists, astrophysical/macro strangeon matter could be manifested in
the form of compact stars (strangeon star), cosmic rays (strangeon cosmic ray),
and even dark matter (strangeon dark matter). This trinity of strangeon matter
is explained, that may impact dramatically on today's physics.
