The ornamental design for a connectingball, as shown and described.
FIG. 1 is a perspective view of a connecting ball showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a reduced environmental view showing multiple connecting balls.
The broken lines in FIG. 1-7 depict portions of the connecting ball that form no part of the claimed design. The broken lines in FIG. 8 depict the environment of the connecting ball and form no part of the claimed design.