Nohousenumber icon based on work by Tobias Zwick of the quest "Housenumber" in the app StreetComplete showing a blue square with an ornament presented on a grey background.
https://web.archive.org/web/20200824044542/https://wiki.openstreetmap.org/wiki/File:StreetComplete_quest_housenumber.svg

based on: https://github.com/westnordost/StreetComplete/blob/master/res/quest_icons.svg (now https://github.com/streetcomplete/StreetComplete/blob/master/res/graphics/quest/housenumber.svg ), for license see https://github.com/streetcomplete/StreetComplete/blob/master/res/graphics/authors.txt
Tobias Zwick/Rugk