id_X
For the identity map on a normal toric variety, the underlying map of lattices is given by the identity matrix. For more information on this correspondence, see Theorem 3.3.4 in Cox-Little-Schenck's Toric Varieties.
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Identity maps also arise as edge cases of the canonical projections and inclusions associated to Cartesian products.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/NormalToricVarieties/ToricMapsDocumentation.m2:478:0.