What is the meaning of Crown jewel?

Crown jewel is a particularly profitable or otherwise particularly valuable corporate unit or asset of a firm. Often used in risk arbitrage. The most desirable entities within a diversified corporation as measured by asset value, earning power, and business prospects; in takeover attempts, these entities typically are the main objective of the acquirer and may be sold by a takeover target to make the rest of the company less attractive. See: Scorched earth policy.