Ma considera la seguente cara ragazza, Redbeck
First symbol on the monolith is the Ancient Greek letter Xi pronounced zz-eye. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh, Phoenician trade also helped facilitate the exchange of cultures, ideas, and knowledge between major centres of civilization such as Greece, Egypt, and Mesopotamia.
The Greek letter was absorbed into the Latin alphabet as X, however, Xi is distinct from the Greek letter chi, which gave its form to the Latin letter X. Xi was also adopted into the early Cyrillic alphabet, as the letter ksi
The original Greek letter Xi is employed in Pure mathematics
Harish-Chandra's Xi function in harmonic analysis and representation theory
The Riemann Xi function in analytic number theory and complex analysis
