I claim the ornamental design for a signaling balloon, as shown and described.
FIG. 1 is a front view of the signaling balloon.
FIG. 2 is a rear view of the claimed design.
FIG. 3 is a left side view of the claimed design.
FIG. 4 is a right side view of the claimed design.
FIG. 5 is a top view of the claimed design.
FIG. 6 is a bottom view of the claimed design.
FIG. 7 is a bottom perspective thereof, shown in a condition of use; and,
FIG. 8 is an enlarged partial detail view of FIG. 7, showing a bottom perspective of the signaling balloon for clarity of illustration.
FIG. 9 is a an enlarged partial detail view of FIG. 7, showing a portion of the signaling balloon for clarity of illustration.
The Signaling Balloon is shown with a symbolic break in its length, as illustrated with the dash-dot lines. The appearance of any portion of the article between the dash-dot broken lines forms no part of the claimed design.