We used to call it "caution tape" or "barrier tape". Now if you're looking for the self adhesive tape it has a couple of names "demarcation tape", "safety tape' some of the guys just called it "no-step tape"
Any good industrial hardware store will have it, also Home Depot has the small rolls.
OH, thank you for posting this in the "I gotta get me some of that" forum because, I gotta get me some of that.
No hijack, but I found this thread trying to find out about the Astronaut suit in your profile pic. I can pm you.