The label of a Belyi map $\phi$ has the form $d$T$G$-$\lambda_0\_\lambda_1\_\lambda_\infty$-m encoding the following data.
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$d$T$G$ is the transitive group label of the monodromy group of $\phi$. Here $d$ is the degree of $\phi$.
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$\lambda_i$ are partitions of $d$ specifying the ramification type of $\phi$, each written using
.as a separator between the parts of the partition. -
m is the Galois orbit label, a non-negative integer written in base 26 using the 26 symbols a, b, ..., z.