What is the origin of the idiom "at sixes and sevens" and when to use it?

The origin of the idiom "at sixes and sevens" is believed to have originated from a medieval gaming term. In the game of dice, the numbers six and seven were considered difficult to place or arrange due to their high value and strategic significance. When players found themselves in a situation where their dice were in disorder or disarray, they would be said to be "at sixes and sevens." It is often used when discussing disorganized or chaotic environments, uncertain decision-making, or situations lacking clear direction.