A 'wen' refers to the fleshy growths, or 'hood', on the top of the head of ornamental fancy Goldfish such as the Oranda.
The Wen series of goldfish are characterized by short body conformation, pointed head and lip, round abdomen, small and flat eyes which don't bulge out of the orbital cavity like other types of Goldfish.
The name "Wen" is said to originated from its back-fin and big tail fin shape, which looks like the Chinese character "wen".
The body colour of "Wen series" goldfish mainly consists of red, reddish black, red-white, blue, purple and dapple of five colours. The leading varieties include "Wen Goldfish", "lionhead and "pearlscale".