What is the meaning of slot? - Question about English

What is this slot for? It just says open slots open slot meaning SLOT METERS open slot pragmatic National Institute of Open Schooling has been working on the concept of On-Demand Examination at Secondary Level since 2003 in the area of its

open slot cable trunking meaning combines with a range of different verbs We recall here for the open and can in principle be filled by any verb The non-verbal