From KDE UserBase Wiki

Insert a GUI icon image in the text. Usage: {{Plan/Icon|1=name-of-file}}.

The icon should be named Icon-name-of-file.png and preferably be uploaded in the size 22x22.

Note: Do not include the "Icon-" prefix or the ".png" suffix in the template.

This does the same as the standard Icon template except for size and alignment.

Example: {{Plan/Icon|view-time-schedule-baselined-add}} yields . [[Image:Icon-{{{1}}}.png|18px|link=]]