those are just text icons. you can find them all over the place. Manup was one of the first to do them, but the ones you've highlighted don't look like his set. those look more like Lekky's TallMin icons. you can find a whole bunch of text icons at the sister site in this thread: Icon Pack Repository
not familiar with it. all i know is that you can get just about any kind of text icons you want (as well as just about any other kind of icon) thru various icon packs throughout the forums. it's not part of a theme. the launchers (like LP and ADW) allow you to edit your icon images. if you have a text icon pack, you can use those as your icon, as shown in your screenshoot.