Second Brain / Standard term
Backlink
A reverse reference showing which records link to the record currently being viewed.
If meeting-note A links to project B, B's backlink view lists A as an incoming reference. Many tools compute this reverse index automatically from the original one-way link; they do not need to store a second manual link. Backlinks can be typed, untyped, contextual, or filtered by access permissions.
Builder example
A reverse-reference index can surface related evidence and changes without duplicating link state. Generated links still need entity resolution and permission filtering, or similarly named people and private records can be connected incorrectly.
Common confusion: A backlink and a one-way link both connect two records, and the difference is which records can see the connection. A one-way link is visible only from the record where you typed it; a backlink is visible from both ends, so the referenced record lists what pointed to it.