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These are the headers you’ve seen elsewhere, female on the top, male on the bottom. They have acquired the name “stacking headers” in the open-source electronics world, for their ability to allow one to create stacking sandwiches of PCBs of arbitrary height. This lets you connect boards easily in a compact way, as opposed to using an extension cable.
Female on the top, male on the bottom, we need say no more.
Sold in bags of five, 25, and 100.