a metasyntactic variable

listen to the pronunciation of a metasyntactic variable
الإنجليزية - الإنجليزية
wibble
metasyntactic variable
A conventional variable name used for an unspecified entity whose exact nature depends on context

Use metasyntactic variables like foo and bar when you need a name but the particular name doesn't matter.

a metasyntactic variable
المفضلات