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Recently, the higher-order topological phases from the chiral AIII symmetryclasses are characterized by a Z topological invariant known as the multipolechiral numbers, which indicate the number of degenerate zero-energy cornerstates at each corner. Here, we report the first experimental realization ofhigher-order topological insulators protected by multipole chiral numbers withusing acoustic crystals. Our acoustic measurements demonstrate unambiguouslythe emergence of multiple corner states in the middle of the gap, as predictedby the quantized multipole chiral numbers. Our study may provoke newpossibilities for controlling sound, such as acoustic sensing and energytrapping.

Acoustic Higher-Order Topological Insulators Protected by Multipole Chiral Numbers