Which Shuttle component protected the absolute hottest zones like the nose cap and wing leading edges?

Answer

Reinforced Carbon-Carbon (RCC) panels.

RCC panels were applied to the absolute hottest areas because they could withstand temperatures approaching $3000^ ext{o} ext{F}$, exceeding the limits of standard ceramic tiles.

Which Shuttle component protected the absolute hottest zones like the nose cap and wing leading edges?
Aerospaceaeronauticsheat shieldthermal protection systemreentry vehicle