The ornamental design for an architecturalpanel, as shown and described.
FIG. 1 is a front elevation view of an architectural panel according to a first embodiment of the new design, the rear elevation view being a mirror image of the front elevation view
FIG. 2 is a front elevation view of an architectural panel according to a second embodiment of the new design, the rear elevation view being a mirror image of the front elevation view;
FIG. 3 is a front elevation view of an architectural panel according to a third embodiment of the new design, the rear elevation view being a mirror image of the front elevation view; and,
FIG. 4 is a front elevation view of an architectural panel according to a fourth embodiment of the new design, the rear elevation view being a mirror image of the front elevation view.
The broken lines illustrate portions of the architectural panel that form no part of the claimed design. The circular and semi-circular features depict through-holes in the architectural panel.