Mirror Arm

FIG. 1 is a top front left perspective view a mirror arm according to the claimed design. FIG. 2 is a front view of a mirror arm. FIG. 3 is a rear view of the mirror arm. FIG. 4 is a right side view of the mirror arm. FIG. 5 is a left side view of the mirror arm. FIG. 6 is a top view of the mirror arm; and, FIG. 7 is a bottom view of the mirror arm. The dash-dash broken lines in the drawings illustrate portions of the mirror arm that form no part of the claimed design. The dash-dot broken lines in the drawings define the boundary of the claim, which extends to the boundary but does not include the boundary. The break sandwiched by the dash-dot broken lines in the drawings illustrate indeterminate length of the mirror arm.