Which tool with a square icon that has "Performance" and "Powersave" is this?

I installed this while looking for a tool for powersaving, referencing an answer here. But it is not serving the purpose. Which tool is this, and how can I remove it?

My Ubuntu version:

Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal

>Solution :

This applet/indicator is named indicator-cpufreq:

You can remove it by

sudo apt-get purge indicator-cpufreq