Is this a lint filter?

[rpms]

A few years back I was at a laundromat. The top loaders had a thingy like this and on the top it said, load line. Is the thingy a lint filter, or a load line thingy that keeps clothes underwater?
If it is a lint filter, how would it work?

 

[tomturbomatic]

It might just be the load line marker. When people are using machines for the first time or machines with which they are not familiar, like in a coin laundry, something that delineates how full to load the machine is probably a good idea. Of course, then you have the people that load loosely to that level and those that want to pack the load down like they are tamping a cannon's charge.