What is Joi in Scrabble?

Excuse me, could you please clarify for me what you mean by "Joi in Scrabble"? Are you referring to a specific rule, a scoring mechanism, or perhaps a certain word or strategy in the game of Scrabble? Scrabble, as a game, involves players forming words on a board using letter tiles, and I'm not familiar with a term like "Joi" being used in that context. Could you please provide some more context or elaboration on what you mean? It would greatly help me to give you an accurate and informative answer.