What is "afro-eurasia"

Afro-Eurasia, Afroeurasia, or Eurafrasia, known in antiquity as the Ecumene and most commonly known since the Age of Discovery as the Old World, is the largest landmass on Earth, primarily in the Northern and Eastern Hemispheres. The term is a portmanteau of its constituent parts: Africa and Eurasia, the latter divided into Europe and Asia. Afro-Eurasia encompasses 84,980,532 square kilometers (32,811,166 sq mi) and has a population of approximately 6 billion people which is roughly 85% of the world population. In geopolitical contexts, it is sometimes known as the World Island, a term coined by H.J. Mackinder.