We have introduced the nomenclature in Chap. 13: the Λ is an isoscalar and the Σ and isovector baryon with one heavy (s, c or b) quark. The Ξ contains two and the Ω three heavy quarks. The number of c or b quarks is indicated by the subscripts c or b. Hyperons are baryons with at least one s quark. Many baryons containing c or b quarks have been identified (Table 1.2).