<https://golftips.golfweek.usatoday.com/golf-fairway-markers-1586.html>
<http://schema.org/description>
"What Are Golf Fairway Markers?. Golf fairway markers are a series of disks placed on courses, usually on par 4s or par 5s, that signify the distance from that point in the fairway to the center of the  green. The markers are color coded according to distance, and while most courses use the same system, check with a course employee if you are unsure."
<https://golftips.golfweek.usatoday.com/golf-fairway-markers-1586.html>