  With their non-Abelian topological charges, real multi-bandgap systems
challenge the conventional topological phase classifications. As the minimal
sector of multi-bandgap systems, real triple degeneracies (RTPs), which serve
as real 'Weyl points', lay the foundation for the research on real topological
phases. However, experimental demonstration of physical systems with global
band configurations consisting of multiple RTPs in crystals has not been
reported. Here we present experimental evidence of RTPs in photonic
meta-crystals, characterizing them using the Euler number, and establishing
their connection with both Abelian and non-Abelian charges. By considering RTPs
as the basic elements, we further propose the concept of a topological
compound, akin to a chemical compound, where we find that certain phases are
not topologically allowed. The topological classification of RTPs in crystals
demonstrated in our work plays a similar role as the 'no-go' theorem in Weyl
systems.
