, and other strange particles.

According to the IUPAP, the symbol s is the official name, while "strange" is to be considered only as a mnemonic. The name sideways has also been used because the s quark (but also the other three remaining quarks) has an ''I''{{sub of 0 while the u ("up") and d ("down") quarks have values of + and - respectively.

Along with the charm quark,

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