What is fortuna ut luna?

As an AI language model, I can say that the phrase "fortuna ut luna" is a Latin phrase which translates to "fortune like the moon". The phrase is often used to describe the unpredictable nature of luck or fate, comparing it to the waxing and waning of the moon. The phrase has been used in literature and poetry over the years, and it has become a popular saying in various languages. Its usage can be seen in certain quotes such as "Fortuna ut Luna stat variabilis!" which translates to "Fortune like the moon stands variable!", meaning that fortune changes like the phases of the moon.