What the F is the C-string?

This is definitely one of the strangest underwear inventions that we’ve seen in a while

Cortez F-6000-12 12-String Guitar - Japan c. 1968

Cello: Bass Clef C string notes: C, D, E, & F Flashcards

Gold Tone F6 F-Style 6-String RH Mando-Guitar with Pickup and Case

Violin C(5) and F(6) Strings

Thong - Wikiwand

Extended Hand Position on Cello - C# on G String, and F# on C

22-String Shepherd Lap Harp

String in C Introduction to String in C Notes

How to Print String in C - Scaler Topics

C Major Scale Chords, Chart of 5th String Root Forms by Jay Skyler

Python's F-String for String Interpolation and Formatting – Real

22-String Shepherd Lap Harp