What do you mean by non-numbers?

Non-number usually means non-number. In computer programming, various types of data are usually used. Numbers are one of the most basic and commonly used data types. Non-numbers refer to all data types except numbers. Such as letters, symbols, Boolean values, dates, times, objects, etc. Although these data types are not numeric types, they are as important as numeric types and are a necessary part of programming.

Non-numbers can also be used to represent unknown or incorrect data. In some cases, there will be errors or exceptions in the program, which will lead to the wrong return of numerical results. At this time, it is necessary to use non-numbers to represent this unknown or incalculable situation. In Python, you can use a special "nan" (not a number) to represent this non-numeric situation. There are similar definitions in other programming languages. Using non-numbers can help the program to better identify errors, thus improving the readability and reliability of the code.

Besides computer programming, non-numbers can have many different meanings in human society. For example, in the field of art, non-digital can refer to those abstract, feathery and unreal works. For example, non-figurative painting, symbolism and abstraction in modern art. In other fields, non-numbers are often used to represent abnormal, unknown or uncertain situations. For example, in the financial market, non-numbers can be used to indicate transaction failure, quotation error and so on. In natural science, non-numbers are usually used to represent phenomena and data that cannot be accurately measured or calculated.