This is a count of jobs in printer queues that have been submitted but are not yet eligible to execute, for example because they are waiting on a required form, stock, or resource. A rising count here tells an administrator that print jobs are queuing up without actually printing, which can indicate a printer waiting on paper or a form mount rather than being down outright. For example, if a batch of invoices requires a special letterhead form that hasn't been mounted, those jobs would sit here as pending until the operator loads the correct stock.