https://blog.wongcw.com/2021/06/25/nixie%e5%9f%ba%e6%96%bc%e7%84%a1%e4%ba%ba%e6%a9%9f%e7%9a%84%e6%b0%b4%e6%8e%a1%e6%a8%a3%e6%8a%80%e8%a1%93%e5%8f%af%e4%bb%a5%e7%82%ba%e5%9f%8e%e5%b8%82%e7%af%80%e7%9c%81%e6%99%82%e9%96%93%e5%92%8c/