What language, spoken by the indigenous people of Tierra del Fuego, is known for being the southernmost in the world and for having a word that became famous in anthropology for its very extensive meaning, often cited as 'mamihlapinatapai'?

Yagán (or Yámana) is the language of the native peoples of the Fuegian archipelago. The word 'mamihlapinatapai' (sometimes 'mamihlapinatapei') is listed in the Guinness Book of Records as the most concise word in the world. It is defined as 'a look between two people who want to start something, but neither of them dares to do it first'. It captures a complex feeling of mutual expectation and hesitation, showing the conceptual richness that a single word can hold.