Re: Dum1...?

[Nicholas Jankowski]

Without more context, I'd say this is a metasyntactic variable [1], a
variable that is meant to mean nothing particular and serves the purpose of
writing an example: other famous examples are "foo" and "bar".

Pantxo

[1] https://en.wikipedia.org/wiki/Metasyntactic_variable

Wow.  I was going to write more about how much effort has gone into such a definition, but I think wow covers it.