My great-grandfather brought home quite a few eye stones from the Carribean around 1890 or so. He and his comrades noticed many them moving about at the water's edge. They were a common commodity in coastal village pharmacies for 50¢ each, considerable money for that time. My great-grandfather brought back a small jar full which netted him handsome pocket money as well as stones for family use. Several are still in posession of family members. They were used to remove grain chaff, ash, grit or similar irritants from the eye. As stated in the question, they would move about for some time, semingly taking up the irritant particles, before dropping out through some natural but poorly-understood stimulus. It is not clear whether they were some sort of marine creature similar to limpets or were merely calciferous in composition. They are all alike in form, resembling ½ a dried pea yet vary in size, in my great-grandfather's words, "from the head of a pin to ½ a kidney bean." Those "kept" in sugar, which seemingly maintains their efficacy, do not grow or shrink. To test an eye stone, put it in a saucer of warm vinegar; it should slowly move about, eventually covering all the dish's bottom. They have yet to be "fully described."
It's inserted into a Socket
In the motherboard socket.
The screw socket into which an ordinary light bulb is inserted.
Fixture where socket is inserted should be grounded to body
Hosel is the the socket (or neck) in the head of a golf club into which the shaft is inserted.
The little slit in the pins makes it flexible when it is inserted in the socket. It helps to make a good contact adjust itself in the socket.
Socket testers work by being inserted into a given electrical socket. From there, they'll read the output of electricity into two nodes without injuring the person using the tester. Most testers will emit a noise when the socket is live and flowing with electricity.
by forming a socket around a ball
PGA socket - Pin grid array
if you mean the plug which you insert into an electrical socket, then you just pull it out. the same goes for the cable which is inserted into the camera
The diagnostic port for most vehicles is located under the steering column where it enters under the dashboard. You'll have to open the driver's door and get down on your knees on the ground to see under the dashboard/steering column. The socket is located about an inch or two below the steering column and about 1" or 2" in from the edge of the dashboard. It's best seen with a flashlight when looking for it for the first time. It's not hanging by wires but secured with screws and facing with the open side of the socket toward the driver. This socket is about 2.5" long and about 0.75" wide with pins inside the socket, often black in color. The plug from the diagnostic tool is carefully inserted into the socket so as to not bend the pins but still be inserted fully into the socket.
The Hosel (one 's') is the socket or neck in the head of a golf club into which the shaft is inserted.