Many Japanese speakers in the #Fediverse call several #Mastodon instances ending with 丼(-don), a pun of mastoDON and DONburi (https://en.wikipedia.org/wiki/Donburi), a popular dish in Japan. For example, a Mastodon instance about vocaloids is Vocalodon (ボカロ丼; https://vocalodon.net/about), and the instance by Vivaldi Technologies is nicknamed Vivadon (ビバ丼; https://social.vivaldi.net).