numeric value to the left of tab name of sd instance in browser?

numeric value to the left of tab name of sd instance in browser?

Hi. We use SD Plus here; this is not really a pressing question, just curious. It seems a number of users will see a number in the tab that is created when logging into servicedesk, that appears directly to the left of the sd name (see attached photo). It's not the number of open/pending tickets, nor is it the number of instances of service desk in use in a browser, since the number does not appear to change in response to either of those things. 

Any ideas?

Thanks!

E

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