olemus
Wiktionary:
1. a strip of material used to mark a place in a book
2. (computing) a record of the address of a file or Internet page, serving as a shortcut to it
Synonym: favourites
3. (databases) a pointer found in a nonclustered index to a row in a clustered index or a table heap

füüsiline
https://duckduckgo.com/?q=bookmark&t=h_&iax=images&ia=images

virtuaalne
näiteks brauseris, e-raamatus
https://en.wikipedia.org/wiki/Bookmark_(digital)