The altermagnet candidate $\mathrm{M}{\mathrm{n}}_5\mathrm{S}{\mathrm{i}}_3$ has attracted wide attention in the context of nonrelativistic spin physics, due to its composition of light elements. In this study, we demonstrate a hallmark of altermagnetism in $\mathrm{M}{\mathrm{n}}_5\mathrm{S}{\mathrm{i}}_3$ thin films, namely the three options, or variants, for the checkerboard distribution of the magnetic Mn atoms. The magnetic symmetries were altered by field-rotation of the Néel vector along relevant crystal directions, resulting in anomalous Hall effect anisotropy. The experimental results in nanoscale devices were corroborated by a theoretical model involving atomic site dependent anisotropy and bulk Dzyaloshinskii-Moriya interaction for a single variant. These findings elevate $\mathrm{M}{\mathrm{n}}_5\mathrm{S}{\mathrm{i}}_3$ from a candidate to a proven altermagnet.

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• Anisotropic magnetoresistance
• Altermagnets