Charting the Triality Webs for All Smooth Fano 3-Folds

We determine all toric phases for the $2d$ $(0,2)$ theories on D1-branes probing the complex cones over the 18 smooth Fano 3-folds, whose toric diagrams correspond to the regular reflexive polytopes in 3 dimensions. These results significantly expand the list of explicitly known gauge theories on D1-branes over toric CY 4-folds. We go beyond the classification of toric phases and map the corresponding triality webs, establishing how the toric phases are connected by triality. The size and complexity of the webs constructed in this work far surpass any previously known examples, both in the contexts of Calabi-Yau 3-folds and 4-folds-with several of these CY 4-folds exhibiting hundreds of toric phases. We propose various new approaches for characterizing triality webs. Our work lays the foundation for a comprehensive exploration of the structure of triality webs.