The page where a backlink is originating from is usually referred to as source page or referring page.
This is the exact URL the link is placed and implemented on.
URL examples of a referring pages could be
- a website page https://www.linkresearchtools.com/wiki/link-growth/
- a website folder https://www.linkresearchtools.com/wiki/
- a website homepage https://www.linkresearchtools.com/wiki/