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What is the mark on the top of Huawei's mobile phone that shows up and down tick marks?

On the top of Huawei's mobile phone, the up and down tick is the "NFC" icon.

How to set this icon (taking Huawei P20 mobile phone as an example):

1. First, use your finger to drop down the floating menu on the home page of your mobile phone.

2. Click the "NFC" icon option.

3. You can turn on NFC mode, and you can see the symbol of tick up and down in the upper right corner of the mobile phone interface.

4. Alternatively, you can click Settings and select the Device Connection option.

5. Click the NFC option to enter, and click on NFC to open this function.