Here's a different take on the Bat-Signal. In the sense that the person flashing it is definitely not the person who needs help. A hand-crafted self defense and EDC tool, the bat slips over fired-up knuckles and thwarts (or initiates...) titanium alloy blows with either its rounded, blunt circumference or pointed ear/wing upper and lower.
The Dark Knight-esque not-a-Bat-Toy is corrosion resistant and non-magnetic. Each piece is made by hand, so sizes and shapes might vary slightly. General dimensions are 2.5" long x 2" wide x 0.2" thick. Finger holes measure about 0.9" in diameter. Weight is 0.8 ounces. (By comparison, the Brutus the Bulldog self-defense keychain, made of ABS plastic, measures 3.5" x 2.5" and weighs about the same.)