See: en.wikipedia.org/wiki/Jiaozi This image was adapted from a picture posted to publicdomainq.net. It is also posted on gahag.net. All of the images on these sites are in the public domain i.e. CC0. This site is only in Japanese but can be easily navigated with Google Translate.
Gyoza free icon was designed by oksmith for icons Png and presented to its users.
oksmith
9/16/2017