Charge is indicated with superscripts. Heavy quark (bottom, charm, or top quarks) content is indicated by subscripts. For example, a Ξ cb is made of one bottom, one charmed quark, and it can be deduced from the charge of the charm (+ ⁠ 2 / 3 ⁠ e) and bottom quark (− ⁠ 1 / 3 ⁠ e) that the other quark must be an up quark (+ ⁠ 2 / 3 ⁠ e). Sometimes asterisks or primes are used to indicate a resonance.