How can I get special symbols for my Mii nickname?

How can I get special symbols for my Mii nickname? - Table setting with candles and skull

For example, I have seen someone with the music note symbol, and I'm confused on how to get these, because I want them.

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How can I get special symbols for my Mii nickname? - Focused black man with valentine accessories

How can I get special symbols for my Mii nickname? - Two Cans With Signages

How can I get special symbols for my Mii nickname? - Festive sparkling silver and blue baubles in box

How To Get Mario Kart Wii Symbols For Your Mii Name! (Works In 2020!)

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