The ornamental design for an arm for an actuatableholding system, as shown and described.
FIG. 1 is a lower-front perspective view of the ornamental design for an entire configuration for an actuatable holding system according to the invention, with the arms shown in a closed position.
FIG. 2 is a lower-front perspective view of the ornamental design for an entire configuration for an actuatable holding system according to the invention, with the arms shown in an opened position.
FIG. 3 is a front view thereof, with the rear view being identical; and,
FIG. 4 is a left side view thereof, with the right side view being identical.
The structures depicted by means of broken lines in the figures have been shown for illustrative purposes only and form no part of the claimed design.