Quick help for ATC

I was doing Approach ATC and I relized one thing I couldn’t understand… You know if airplanes are on your frequency they show up as a list on the top right of your screen and pretend if someone wanted to do a ILS Approach for example Runway 27 for San Diego it would show up as “27 ILS” but I saw something different there was a word called “LOC” and I don’t understand it… Is it Location or something like or of what exactly? Thank you!

Pretty sure LOC means localizer