The 24th letter of the English alphabet. Pronunciation /eks/, because of its pronunciation, is the letter with the least initials in English letters.
X stands for infinity, and X also has "goal" and "hope". Some words are obscure and difficult to translate directly, and they are represented by "XXX", and so on. 3 x represents an unknown number in mathematics, and the letter also represents a number. The size is unknown, which may be 2 or 5. Letters other than x are also acceptable, such as a, b and so on. In the coordinate system, x is often used to identify the abscissa variable. The other y axis represents vertical coordinates.
The 24th letter of the English alphabet comes from the hieroglyphics representing "fish" and is pronounced samekh in Painiki. X stands for 10 in Roman numerals, and is usually used to represent unknowns in algebra and mathematics. When algebra was introduced into Europe from Arabia, the word shei, which means "unknown" in Arabic, was translated into xei, so the initials X became the common code name of unknown.
There is another saying about the origin of the letter X: X was originally a pictographic symbol for kissing. If it's written as an X, it's a bit like kissing with two mouths. This explanation may come from folk etymology.
26 English letters
Aa、Bb、Cc、Dd、Ee、F、Gg、Hh、li、Jj、Kk、LI、Mm、Nn、Oo、Pp、Qq、Rr、Ss、、Uu、Vv、Ww、Xx、Yy、Zz .