..or "elastic modulus", another term for same. (Presumably used by those nefarious mechanical engineers who have no intention of giving Mr. Young his due.) Typically measured in Pounds per Square Inch. A carbon structure with an elastic modulus of 45,000lbs/sq. inch -- I'm thinking of the original Ned Steinberger monocoque electric bass guitar -- would certainly qualify as "high modulus", & is extremely stiff indeed. Damn near indestructable, in my experience. But I'm pretty sure "high modulus" bike parts aren't nearly as "high" as Steinberger basses.

But come to think of it, do any bike manufacturer's list the actual elastic modulus of their carbon parts, or do they just call it "high modulus" & pray you don't request a precise measurment?