This looks like a remnant from the Grand Prix fencing and posts. There have been dozens of these laying around after the fencing was dismantled. In addition there are rusty wire things all over too and globs of melted race tires. I picked up many as I imagine others did.

Thank you for reporting this issue to us via SeeClickFix St. Pete. We have forwarded the details you have provided to the Community Services Department so that they may investigate and take any necessary action. We appreciate your help! Sincerely, Mayor's Action Center

CSR3 assigned this issue to SPTO Admin 7

This issue was resolved on 5/6/17

Thank you!