What’s this strap for on the manual transmission hump

Menopause sucks they are a different person almost.
They make pills for it now. My wife was a little cranky earlier this week. (this is the gospel) I called her out on it, but we are watching our teething 4 month old grand daughter from 6pm to 6 am and she played it off on that. Yesterday she had to go to town spur of the moment. She had been out of the pills since Monday!