Lobes

From Memory Alpha, the free Star Trek reference

Lobe is a Ferengi term referring alternately to the rims of their ears, and in a colloquial sense, the business acumen of an individual Ferengi. The expression may represent customary Ferengi sexism, as Ferengi women have smaller lobes than men, and were formerly forbidden to participate in business.

Physically, the lobes are a highly sensitive area; they are an erogenous zone that produce feelings of pleasure and contentment when stroked, as in oo-mox, but are also very sensitive to pain. (DS9: "Family Business")

Ferengi will often use lobes to emphasize the intelligence, or lack of it, of a particular business maneuver. Quark regularly told Rom that he didn't have the lobes for business. (DS9: "The Nagus")

Quark explained the term to Karemma Minister Hanok in 2372. (DS9: "Starship Down")