FIG. 1 is a front perspective view of a arm for use with mounting systems for mounting flat panel televisions or the like showing my new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a rear elevational view thereof.

The ornamental design which is claimed is shown in solid lines in the drawings. The broken lines in the drawings arc used herein to define the bounds of the claimed design. The bottom surface of the design is devoid of claimed surface ornamentation.