On the computer: press and hold the "Alt" key on the keyboard, then press the number, release the "Alt" key and print the corresponding symbol.

In the mobile phone: 1, look for it in the digital symbols in the input method App; 2. Copy someone else's and paste it.

Brief introduction of mathematical symbols

The invention and use of mathematical symbols are later than numbers, but their number exceeds numbers. There are more than 200 mathematical symbols commonly used in modern mathematics, and each symbol has an interesting experience.

For example, there used to be several kinds of plus signs, and the "+"sign is commonly used in modern mathematics. "+"comes from Lavin "et" (meaning "harmony"). /kloc-in the 6th century, Italian scientist Nicolo Tartaglia used the first letter of Italian word "plu" (meaning "add") to indicate addition, then "μ", and finally they all became "+". The number "-"is derived from the Latin word "minus" (meaning "minus"). It was abbreviated to M at first, but later it was simplified to "-"because it was written quickly.