What does 7 mean?

1. refers to 7 in Arabic numerals.

2. It refers to the 7-digit system.

3. It refers to odd numbers.

4. refers to the largest single-digit prime number

5. It refers to the second mersenne prime.

7, Arabic numerals, is a natural number between 6 and 8, and is the fourth prime number. It is equivalent to the Chinese word "seven" or "seven". In number theory, 7 is a higner number.

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Other statements

life

1. A scientific study in the United States pointed out that sleeping 7 hours a day is the most suitable sleep time for the human body.

According to the definition of chemists, a pH of 7 means that the solution is "neutral", that is, neither acid nor alkali. The pH value of pure water is 7, while the pH value of people's daily water is very close to 7.

history

The July 7th Incident (1), also known as the Lugouqiao Incident and the July 7th Lugouqiao Incident, was a Sino-Japanese military conflict that took place in Beiping, China1July 7th, 937. Japan launched an all-out attack on China. The July 7th Incident was deliberately created by Japanese imperialism to realize its ambition of annexing China, and it was the beginning of its full-scale invasion of China. The film and television works of the same name were directed by Li Qiankuan and Guiyun Xiao and produced by 1995.

The crashes of American space shuttles Challenger and Columbia dealt a severe blow to American space industry. When two space shuttles crashed, there were seven passengers on board, either astronauts or volunteers preparing to experience life in space.

celebrity

1. On the football field, how many fans are crazy about the talented star who once wore the No.7 jersey? They include former English captain David Robert Joseph Beckham, former Spanish captain Raul Gonzá lez Blanco, legendary British stars george best and Kenny Dalglish, French star eric cantona, Portuguese stars Madeira Filippo and cristiano ronaldo.

2. Elizabeth Taylor and Lana Turner are famous American movie stars. They have seven husbands respectively and entered the marriage hall eight times. Larry King, a well-known host of CNN, has been married seven times and has six wives.

References:

Baidu Encyclopedia -7