The ornamental design for a pinkribbonarm, as shown and described.
FIG. 1 is a front perspective view of a pink ribbon arm shown with the environment;
FIG. 2 is a front elevation view thereof shown with the environment;
FIG. 3 is another front elevation view thereof shownout with the environment;
FIG. 4 is another front perspective view thereof shown without the environment;
FIG. 5 is a rear perspective view thereof shown without the environment;
FIG. 6 is a side elevation view thereof shown with the environment; and,
FIG. 7 is a top plan view thereof shown with the environment.
The drawings are lined for color. The lining indicated by parallel vertical lines represents pink. The broken lines in the drawing views represent environmental subject matters and form no part of the claimed design.