Chair arm

FIG. 1 is a perspective view of a chair arm showing my new design, the broken line showing of the chair is for illustrative purposes only and forms no part of the claimed design; FIG. 2 is a top, front, outside, perspective view of the chair arm. FIG. 3 is an outside elevational view of the chair arm. FIG. 4 is an inside elevational view of the chair arm. FIG. 5 is a front elevational view of the chair arm. FIG. 6 is a rear elevational view of the chair arm. FIG. 7 is a top plan view of the chair arm. FIG. 8 is a bottom plan view of the chair arm. FIG. 9 is a cross-sectional view of the chair arm, taken in the direction of the arrows 9—9 in FIG. 3. FIG. 10 is a cross-sectional view of the chair arm, taken in the direction of the arrows 10—10 in FIG. 3. FIG. 11 is a cross-sectional view of the chair arm, taken in the direction of the arrows 11—11 in FIG. 3. FIG. 12 is a cross-sectional view of the chair arm, taken in the direction of the arrows 12—12 in FIG. 3; and, FIG. 13 is a cross-sectional view of the chair arm, taken in the direction of the arrows 13—13 in FIG. 3.