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Multi-loop Feynman integrals are key objects for the high-order correctioncomputations in high energy phenomenology. These integrals with multiplescales, may have complicated symbol structures. We show that the dual conformalsymmetry sheds light on the alphabet and symbol structures of multi-loopFeynman integrals. In this paper, first, as a cutting-edge example, we derivethe two-loop four-external-mass Feynman integrals with uniform transcendental(UT) weights, based on the latest developments on UT integrals. Then we showthat all the symbol letters can be nicely obtained from those ofclosely-related dual conformal integrals, by sending a dual point to infinity.Certain properties of the symbol such as first two entries and extendedSteinmann relations are also studied from analogous properties of dualconformal integrals.

A study of Feynman integrals with uniform transcendental weights and the symbology from dual conformal symmetry