[まるまる, marumaru](n) symbol used as a placeholder (either because a number of other words could be used in that position, or because of censorship)[Add to Longdo]
[なになに, naninani](pn, adj-no) (1) such and such (when being vague, placeholder, etc.); this and that; (int) (2) What?; What is the matter?; What are the items?[Add to Longdo]