On the wiki for OpenHab 1, it’s stated that the icons can be found on ${openhab_home}/webapps/images/
I can’t find the same folder in OpenHab2.
Where can I find the names of the default icons I can use?
http://docs.openhab.org/addons/iconsets/classic/readme.html is your friend.
Just in case someone stubles upon this posting… current link is https://www.openhab.org/docs/configuration/iconsets/classic/ as @chipr stated 
In fact, OH2 has the same icons, you can use them as svg or png icons (depends on setup), If you need to use additional icons, you will have to put them into ./conf/icons/classic/
Please remember, that the ./conf folder is /etc/openhab2/ for apt-get installations (raspberry, debian…)
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thanks
yes I figured out it was the same set, yet as I don’t have an instance of OH1, that did not help me…
If you are using firefox, just right-click on an icon (see my link above) and click “show graphic info” (not sure if this is the correct term, as I use the german translation for firefox) In the new window you can scroll through all icons an see the distinct name of the icons. E.g. for using the cinemascreen icon, use
Rollershutter "Screen is [%d %%]" <cinemascreen> {...}
so, the value of the item will select, which icon is presented, from cinemascreen-0 to cinemascreen-100.
sorry @Udo_Hartmann I was not clear, your answer did help me. knowing it was the same set as OH1 was what did not help me.