https://www.bbc.co.uk/news/business-66284304

X = 10 in Roman numerals
The word Illuminati begins with an I or eye and contains 10 letters
The pyramid is the symbol of the illuminati
The pyramid is an X from the perceptive of a bird
X marks the spot, or where to look
X rays
Why is called an X-ray?
According to Wikipedia, the German physicist, Wilhelm Röntgen, discovered X-radiation in 1895, though he is not the first to have observed its effects.
An X-ray can see inside. It collapses the barriers of privacy, so is a very powerful invention. If the implications of what X represents are considered, then was use of the letter X, in X-ray, just a coincidence? The X has the power to look inside everywhere, even inside any person.
X, in mathematics, literally means multiplication (times), was the illuminati responsible for devising time as we know it as a means to watch and control society?

X can also be said to represent the vital energy force, which in Chinese is called Ch'i, Qi, or simply "Chi". In Chinese, Chi is the twenty-second letter of the Greek alphabet, which is X.
Someone who has a lot of vital energy force is said to have the X-factor. The X Factor is a television music competition franchise based on that idea.

An X-Factor crown crossing their arms:

In George Orwell's "1984", the crowd crosses their arms to Big Brother:

Chi or X is often used to abbreviate the name Christ, as in the holiday Christmas (Xmas).
In Plato's Timaeus, it is explained that the two bands which form the soul of the world cross each other like the letter Χ.
See:
https://en.wikipedia.org/wiki/Chi_(letter)
Elon Musk isn't the first person to use X as a symbol for a business (and there are many more eXamples in one form or another too):

The triple X (or XXX) is a whole other subject!
The letter X is made up of a total of 6 lines. Therefore, XXX = 666
XXX is a symbol used to refer to hard-core pornography, which you're not supposed to see.
Even bollards in Amsterdam are marked XXX
