Characters-The earliest history can be traced back to 1 century, and the earliest is the linking of Latin et (meaning and). The earliest &; Much like the combination of E and T, with the development of printing technology, this symbol gradually formed its own style, out of the original shadow. In this character, you can still see the shadow of e, but t has disappeared.
2.# in mathematics generally represents the meaning of numbers, and in many places it represents the meaning of numbers.
For example, the file record indicates the file number 1, number 2 and so on in the form of # 1 and #2. The representation methods of buildings are # 10 1, indicating buildings 1, rooms 1 and so on.
Hope to adopt, thank you!