In the discussion before the ATC chaps said that......
They are having conferences on the subject because it isn't actually defined as such internationally.
There are some countries which have thier own procedures eg US but many don't but there is urban myth that there is a procedure eg UK its fly the missed approach for the instrument approach you were orginally cleared for.
Apparently its all very complicated and one shoe doesn't fit all.
The only real way to find out is to ask.