= (p,q) string
{title2=$T_{p,q}=\frac1{2\pi\alpha'}\sqrt{p^2+q^2/g_s^2}\quad(C_0=0)$}
= Dyonic string
{synonym}
A <(p,q) string> carries $p$ units of <fundamental string> charge and $q$ units of <D1-brane> charge. Coprime integers label an elementary primitive charge vector; nonprimitive vectors describe multiple units. The displayed tension uses the string metric and vanishing axion. In the <M-theory torus duality>, it comes from an <M2-brane> wrapped on the corresponding primitive one-cycle.
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