A strange particle is an elementary particle with a strangeness quantum number different from zero.
Strange particles are members of a large family of elementary particles carrying the quantum number of strangeness, including several cases where the quantum number is hidden in a strange/anti-strange pair, for example in the Φ meson.
The classification of particles, as mesons and baryons, follows the quark/anti-quark and three quark content respectively.
Murray Gell-Mann recognized the group structure of elementary particle classification introducing the flavour SU(3) and strangeness as a new quantum number.
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