The Natural World
Several natural phenomena are sometimes represented as charges. These include:
Comet, moon, rainbow, star, sun, whirlpool
The whirlpool is more properly known as a gorge and is a special charge that covers the whole of the field.
The moon may be full, increscent, decrescent.
There is also a thunderbolt, which may be shafted and winged of a different tincture.
The ford is an ordinary that represents a natural object.