2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/188141We study the origin of non-Abelian discrete flavor symmetries in superstring theory. We classify all possible non-Abelian discrete flavor symmetries which can appear in heterotic orbifold models. These symmetries include D_4 and Delta(54). We find that the symmetries of the couplings are always larger than the symmetries of the compact space. This is because they are a consequence of the geometry of the orbifold combined with the space group selection rules of the string. We also study possible breaking patterns. Our analysis yields a simple geometric understanding of the realization of non-Abelian flavor symmetries.27 pages, 4 figures, v2: matches version published in Nuclear Physics BHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext