indextracker
nounUK /ˈɪndɛksˌtrækə/
US /ˈɪndɛksˌtrækər/
A tool that keeps track of where things are listed.
The indextracker helped us find the book on the shelf quickly.
OTHER MEANINGS
2. A person who keeps an index up to date.
The indextracker at the library organized all the new books.
3. A computer program that follows changes in an index.
The indextracker updated the search list every hour.
4. A small device that marks a place in a list.
She put an indextracker on the page to remember where she stopped.