Actually, the title might be misleading. But this is an old Atlantic Coast Line Railroad-era railway milepost along the CSX Carters Subdivision west of the northwest corner of Railroad Avenue and Murphy Street in Davenport, Florida. I forget where I read this, but each line might've been an indication of how long you're supposed to blow your horn. If I'm wrong, I'll gladly correct my error.
<a href="//commons.wikimedia.org/wiki/User:DanTD" title="User:DanTD">DanTD</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>