This is an example of the numix circle icon theme. The theme (borders and controls) is also installed at the same time.
numix-circle-icon-linux-mint-17.3-rosa

Numix is a very professional looking theme and can be used on any distributions but furthermore

Numix-circle-theme and Numix are the themes Sardi uses as a fallback.

Sardi will inherit from Numix.

Various good links can be found on the net:

The have one thing in common.

They all use the ppa or personal package archives to download the icons. This has the advantage when the numix team updates their package that our linux mint updater will download the latest numix circle icons.

The structure is always similar but the name of the ppa is very personal

General:

Adding a place/repository to the download/update list

Getting also the list of software, icons, themes, … of this new place/repository

Installing the package you actually want.

In short: installing icons and theme

You will see that numix-icon-theme will be installed as well. Numix-icon-theme-circle theme depends on the numix-icon-theme.

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