Traditional splash cymbals are relatively quiet and don't last for long, but have a high pitch sound.
They are basically a smaller version of a Chinese gong (where its name originates from).
There are many other custom effect cymbals, in great variety from different makers.
Drumbal cymbals are designed to rest on the top skin of a snare drum to modify its tone.
Rocktagon cymbals by Sabian are a unique eight-sided design, midway between a crash and a china.