G-string

noun3

1. •
   A scanty covering for the genitalia, with a thin strip of fabric that passes between the buttocks.

   • Her hands snaked down to her sides and suddenly she had torn away the strip of lace. She threw it into the audience. There was nothing now but a single black G-string. — 1954
2. •
   A type of loincloth or breechcloth.
3. •
   On a stringed musical instrument, the string that produces the note of G.