What is this slot for? It just says open slots

Personally I'd associate slot with time slot, a particular span of time available for things

A slot is a narrow opening in a machine or container, for example a hole that you put coins in to make a machine work

open slot injector TIME SLOT definition: 1 a time when something can happen or is planned to happen, especially when it is one of several… Learn more

open slot apk pragmatic mod injector download TIME SLOT definition: 1 a time when something can happen or is planned to happen, especially when it is one of several… Learn more