What is the meaning of 'Orbis terrae' in Latin?

'Orbis terrae' in Latin translates to 'the world, the earth.' The term 'orbis' means 'circle' or 'sphere,' often used to denote completeness or entirety, while 'terrae' is the genitive case of 'terra,' meaning 'of the earth' or 'land.' Together, these words encapsulate the idea of the entire globe or the earthly realm as a unified entity. This phrase has historically been used in various contexts to refer to the entirety of the known world, emphasizing its geographic and symbolic significance. The other options, while appealing, refer to different concepts that do not align with the primary meaning of the phrase.