Tools/materials: Huawei P40, HarmonyOS2.0, WeChat 8.3.0, sogou Input Method 2 1.5.3.
1, open WeChat.
2. Click the dialog box.
3. Click the character in the keyboard interface, and then click the character icon.
4. Select Mathematics In the pop-up interface, select Mathematics.
5. Click the ‰ symbol in the math interface, and then click the ‰ symbol.