The ornamental design for a symmetricalholster, as shown and described.
FIG. 1 is right side view of a symmetrical holster showing our new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a rear view thereof; and,
FIG. 7 is a left side view thereof, similar to FIG. 2, showing the arrangement of a pistol in the symmetrical holster.
The broken line portions showing surface cavities, contours and through-holes in FIGS. 1-7, and the exemplary pistol outline in FIG. 7, are shown to illustrate environment only and form no part of the claimed design.