Icon Viewer is a Blender add-on that lets you click an icon to copy its name to the clipboard. It sits in the Text Editor under the Dev tab.
The add-on was originally part of Blender 4.1's bundled add-ons and was created by roaoao. It is now offered as-is with limited support and requires no special permissions to run. Its documentation is available through the developer's page.
Icon Viewer is compatible with Blender 4.2 LTS and newer and is distributed under the GNU General Public License v2.0 or later. The current release is version 1.4.2, a compact 3.7 KB download. Since publication it has been downloaded more than 26,000 times and holds a 5.0 rating across nine reviews. On the blender_extensions library it sits at popularity rank 163.