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One of the most well known natural numbers is 11. It follows the number 10 and precedes the number twelve. In English, it is the only two-digit negative integer. Other languages, including Germanic and Latin, also have their own word for 11 (e.g., elisabeth). In many cases, it is also the first repdigit. It is an interesting fact that the first digit of the ten-digit hexadecimal code is 11 and its symbol is a T.

11

The number 11 is also found in many astronomical phenomena. It is used to identify planetary motions, such as the sun’s cycle, which occurs roughly every 11 years. In the Periodic Table, the atomic number of sodium is 11. The other atomic number is X, which is the same as the atomic number of potassium. The asteroid M11 is found in the constellation Scutum. Although there are many other uses for the atomic number 11, it is the most frequently referred to in cosmological contexts.

Apart from its use in astronomical calculations, the number 11 has many other uses. For example, in blackjack, the Ace can represent either a one or an eleven. In French, it is known as Aude. It has a unique flavor that is unmistakably related to fleur de sel. Its unique salty punch makes it a perfect finishing salt. Its high sodium content makes it ideal for baking. Among its many uses, it can be regarded as a low-cost tourist attraction in London.