What is the meaning of “bis”?
I have seen this in a couple of places, but I cannot find a satisfactory meaning in any dictionary. It may well be some sort of abbreviation and may be French or Latin - but I don’t know.
For example, modem standards are indicated as being V.21, V.22 or V.22 bis.
I have also seen bis on the Paris Metro.
In both cases, the context seems to imply a meaning such as “extension”.