The frenular delta is the triangular area of inner foreskin on the underside of the penis, just below the glans, with the frenulum at its tip and the ridged band forming its sides and base at the junctional rim.

Quick Scoop

In simpler terms, it’s the small ventral mucosal zone near the frenulum, not the frenulum itself. Some descriptions also note that it can be especially sensitive and is sometimes called a “sweet spot” in popular explanations.

If you meant a different anatomy term, I can help identify that too.