I think it's called eyelet or eyelet lace.
An eyelet is a small round hole in leather or cloth for threading a lace, string, or rope through.
An eyelet
Islet is a homophone for eyelet. An islet is a small island. An eyelet is a small round hole in a piece of cloth or leather that is used for threading rope, lace or string through. Eyelets are usually round metal rings.
eyelet from Annie
Eyelet Eyelet
Eyelet is a type of material, similar to lace, usually a holey fabric.
An "Islet" is a small island.It is also a homophone with the word "Eyelet", which is a metal lining of a small hole in material, like the eyelets in shoes.
There several eyelet setting kits on the market with complete instructions, some of the newer eyelet kits are not as effective as the older ones, the most common problem is the wrong size hole for the size eyelet, what ever size eyelet you use, use the proper size hole (most kits have hole dies for that size eyelet) and follow included instructions.
Do you mean in hooking up for aerial sound, that there is a wire with an eyelet?
eyelet
Grommet