There are currently three questions with the [sysv](https://askubuntu.com/questions/tagged/sysv "show questions tagged 'sysv'") tag ; I don't think this really adds much. It is used to describe "sysv-like" behavior, and cases where it is used would be better served by describing how it is relevant, in the context of an answer or question, not as a tag or as shorthand. 

I think the other tags cover the init behavior and sysV-ish behavior well enough.