The ornamental design for a taillightsignature, as shown and described.
FIG. 1 is a front right side perspective view of a tail light signature, showing a first embodiment of our new design;
FIG. 2 is a front left side perspective view thereof;
FIG. 3 is a rear, right side perspective view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is front elevation view thereof, shown within an environment of use; and,
FIG. 7 is a front elevation view of a tail light signature showing a second embodiment of our design within an environment of use.
The broken lines depict boundaries and form no part of the claimed design. Features of the tail light and the depiction of a vehicle shown de-emphasized in half-tones represent environmental subject matter that forms no part of the claimed design.