kcharselect 4:17.04.3-0ubuntu1 (amd64 binary) in ubuntu bionic

 KCharSelect is a utility for finding special characters which are not
 available on the keyboard. It can search for characters by Unicode number,
 display characters in any font, and copy characters to the clipboard so they
 can be pasted into documents.
 .
 This package is part of the KDE utilities module.