مزون های بدون چربی مزون های ساخته شده از جفت کوارک ها و ضدقارچ ها از عطر و طعم مشابه (همه آنها [[flavourعدد quantumکوانتومی numberطعم]]sares zeroصفر: ''[[Strangeness|S]]'' = 0, ''[[Charm (quantum number)|C]]'' = 0, [[Bottomness|''B''′]] = 0, ''[[Topness|T]]'' = 0).<ref name=note>For the purpose of nomenclature, the isospin projection ''I''<sub>3</sub> isn't considered a flavour quantum number. This means that the charged pion-like mesons (π<sup>±</sup>, a<sup>±</sup>, b<sup>±</sup>, and ρ<sup>±</sup> mesons) follow the rules of flavourless mesons, even if they aren't truly "flavourless".</ref> The rules for flavourless mesons are:<ref name=PDGMesonsymbols/>
