locator
nounUK /ləʊˈkeɪtə/
US /ˈloʊkeɪtər/
A locator is a thing that helps you find where something is.
The map on my phone is a locator that shows where I am.
OTHER MEANINGS
2. A small device you attach to something so you can find it if it gets lost.
She put a locator on her keys so she could find them.
3. A tool or feature on a website that helps you find a store or place.
Use the store locator to find the nearest shop.
4. A word or symbol used in a computer program to point to a specific place.
The program uses a locator to mark the right line of code.