It's the female half of a D-sub contact pair — mates with the corresponding pin contact in the same series. You'll find these in harness assemblies for industrial controls, data communication gear, and test equipment where a reliable, field-terminable D-sub connection is needed.
Wiring This Socket — Gauge and Termination
The 18-22 AWG range covers the most common signal and low-power wire sizes for D-sub applications. The stamped construction keeps the cost per position down compared to a machined contact, but the trade-off is a slightly lower mating-cycle life — fine for a harness that gets assembled once and mated a handful of times.