The area of a black hole’s event horizon indicates its entropy.

Evidence

the area of the event horizon was a measure of the entropy of the black hole. — Hawking, Stephen, A Brief History of Time, 180

Categorization

• corroborated: 2 independent passages support this claim — Hawking, Stephen, A Brief History of Time, 180
• XREF: connects to: The event horizon’s area never decreases over time. — Hawking, Stephen, A Brief History of Time, 177

Related

• The event horizon’s area never decreases over time. (similarity 0.93)