1, first switch the computer input method to sogou input method;

2. Then place the mouse cursor at any position in the status bar of sogou input method, and then click the right mouse button;

3. On the pop-up page, click "Expression &; Symbol ";

4. Then click "Symbol Daquan";

5. After entering the Symbol Encyclopedia, click the "Digital Serial Number" on the left, and you will find it on the right. 、? , click on them and type them out;

6. The results are as follows.