"?" It's called "checkmark", and when read, it means that "checkmark" is completely correct. This symbol was not imported from abroad, but was born and raised in China, and was widely used in ancient and even modern social life. "?" No matter in official, folk, ancient and modern times, it is a symbol with high usage rate.

Homework correction

"?" It is one of the symbols used uniformly by teachers in correcting homework in China. It means "correct", and the opposite symbol is "X", which is called "cross" and means error. When Japan changed the test paper, "?" The answer is wrong. Please check again.

announce

The most typical example is judgment. In ancient times, when executing the death penalty, the judicial procedure stipulated that the Ministry of Punishment should report to the emperor for "approval".

Issue an announcement

Like the admission list. At the end of the published list, tick off the last name in red, indicating that the list is correct, which is the end. The last one on the list used to be called "sitting in the red chair".

Account book settlement

In the past, the daily accounts kept by the firm were settled in May, August and Spring Festival, except for daily accounts and monthly accounts. The liquidator put a "red tick" in the settlement office, and the red tick was "√", indicating that the accounts had been checked clearly.

Brand application

There is a very well-known brand "Dui" brand, which integrates the check mark into the brand LOGO.

mathematical symbol

√ Mathematically called "root sign", which means to find the arithmetic square root of a number. (that is, the square is equal to the positive number of this number). Negative numbers have no arithmetic square root.

For example, pi (π, 3. 14 159265358979), natural rate (e, 2.7 1828), Fibonacci golden section (φ, 0.6 18033), imaginary number (.

Such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (∩ ~), logarithm (log, lg, ln,