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1. A flat key for a locking cylinder, in particular for locking systems, comprising substantially flat and approximately parallel flat key sides, a key rear section at a top, and a key front section at a bottom opposite the key rear section, toothed on an end face of the key front section, for positioning tumbler pins divided into core pins and housing pins, which are spring-loaded in corresponding key channels of cylinder cores against the key front section in a direction of the key rear section, wherein grooves formed as profiled variation elements and profiled guiding elements are provided in the flat sides of the flat key, wherein first and second grooves of one flat side of the flat key overlap and are undercut in opposite directions with respect to the flat side of the flat key, wherein third and fourth grooves are provided in the outer flanks of the first and second grooves, respectively, and in that at least one region of said third and fourth grooves forms a further undercut that is not visible from the side, wherein along a direction from the key rear section to the key front section, the third and fourth grooves extend further into the flat side of the flat key than the first and second grooves.
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