Fastforty summed it up when he said anything can be tactical. I once had a self defence trainer demonstrating house hold items as tactical weapons-
rolled up newspaper, pen (especially aluminium ones that won't break off), coins stuffed into a sock or stocking make a wonderful black jack- it is amazing how many weapons are out there and can be readily improvised.
Just pick an item up-you can assess if it is going to break if it is jabbed into someone or they are struck with it.