It depicts the four "blue buildings" devoted to science...clockwise from one o'clock: the Martin A. Pomerantz Observatory (MAPO) with attached telescope; the IceCube Laboratory with its two towers which provide for cable entry from the thousands of neutrino detectors; The Atmosphericl Research Laboratory (ARO) occupied by NOAA, and the Dark Sector Laboratory (DSL) and attached South Pole Telescope (SPT).
Above...two more views of the marker. It was designed by SPT winterover Kevin Zagorski (thanks for the info Kevin) and fabricated by utilities technician Luke Noel. The top photo is from 2025 winterover Sheryl Seagraves, and the bottom two photos are from Timmy Mullen who made two trips to Pole this summer as part of the South Pole Traverse (SPoT)