How is the default user avatar generated?

Is there a name for the default avatars that are generated for users who do not assign one themselves and register using an authentication mode other than Google or Facebook? Not the avatar of the blank user, but the one made up of shards, shapes, and colours: Is there an online generator for something like that? See also: How do I change my profile picture, or avatar? Return to FAQ index

[snomof]

stackoverflowのデフォルトのアイコンってidenticonって名前なんね。ハッシュからパターン作ってるみたい.