There is a cool looking sign I just learned yesterday- the sign for Dolphin (porpoise):
Dolphin (porpoise): With the extended left index finger, palm facing in, touching the right wrist, move the right B hand from right to left with a double movement by bending the wrist. Then move the right B hand, palm facing left and fingers pointing up, in a large upward arc over the left arm held across the chest, ending with the right fingers pointing down in front of the left arm.
