Use this patch file and it should work for you. 

    <configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
      <sitecore>
        <settings>    
          <setting name="ItemNameValidation">
            <patch:attribute name="value">^.*$</patch:attribute>
          </setting>
       </settings>
      </sitecore>
    </configuration>

According to this regex `.*` matches any character. And you will be able to create items. Here is the screenshot. 

[![enter image description here][1]][1]

But OOTB you can use the **Display Name** to show the name like this. 

[![enter image description here][2]][2]

Hope this helps. 


  [1]: https://i.sstatic.net/pB97SdBf.png
  [2]: https://i.sstatic.net/FyXFe7sV.png