The name of pins/plugs for northbridge/southbridge heatsinks

The name of pins/plugs for northbridge/southbridge heatsinks

I’m in need of the name for the pins/plugs that are used to hold the heatsinks for the northbridge and southbridge in place. I at first assumed they would be named a plug (similar purpose to what a masonry/plasterboard wall plug are used for), but as we are referring to electronics, the term ‘plug’ are predominantly referring to something completely different, therefore haven’t found what I was after on a quick google search.