X (named ex /ˈɛks/, plural exes[1]) is the twenty-fourth letter in the modern English alphabet and the ISO basic Latin alphabet. In Roman numerals, it represents 10.
In Ancient Greek, 'Χ' and 'Ψ' were among several variants of the same letter, used originally for /kʰ/ and later, in western areas such as Arcadia, as a simplification of the digraph 'ΧΣ' for /ks/. In the end, more conservative eastern forms became the standard of Classical Greek, and thus 'Χ' (Chi) stands for /kʰ/ (later /x/). However, the Etruscans had taken over 'Χ' from western Greek, and it therefore stands for /ks/ in Etruscan and Latin. The letter 'Χ' ~ 'Ψ' for /kʰ/ was a Greek addition to the alphabet, placed after the Semitic letters along with phi 'Φ' for /pʰ/. (The variant 'Ψ' later replaced the digraph 'ΦΣ' for /ps/; omega was a later addition).
AAA = The letter X… it’s what letter of the alphabet? Now add 402. BB = Now, take that number (No, not the answer for AAA, just the letter of the alphabet answer) reverse it, add 3 and multiply by 2. Are you right?.