Spin(7) orientifolds and 2d $$ \mathcal{N} $$ = (0, 1) triality

We present a new, geometric perspective on the recently proposed triality of 2d $\mathcal{N}=(0,1)$ gauge theories, based its engineering in terms D1-branes probing Spin(7) orientifolds. In this context, translates into fact that multiple theories correspond to same underlying orientifold. show how orientifolds particular involution, which we call universal give rise precisely original version triality. Interestingly, our work also shows space possibilities is significantly richer. Indeed, general extend can be regarded as consisting coupled $\mathcal{N}=(0,2)$ and $(0,1)$ sectors. The construction at singularities therefore leads extensions interpolate between pure cases.