American Sign Language: "seahorse"

SEAHORSE:
Version 1:
Spell S-E-A and sign horse.

SEAHORSE:
Version two: Sign sea and horse.

SEAHORSE:
Version 3: Classifier X
You would use this next version of the sign for "seahorse" after you've already established that you are talking about seahorses.  This version could be considered a "classifier" that shows the general size, shape, and movement of a seahorse.  You could alter the movement and shape of this to tell a story about how a seahorse was moving or behaving.   You could add the left hand to your signing sphere to indicate a second seahorse and show how they interact.