In August 2012, the United Nations Office for the Coordination of Humanitarian Affairs (OCHA) created a set of 500 freely available humanitarian icons to help relief workers present emergency and crisis-related information quickly and simply. See more at: World: Humanitarian and Country Icons 2012.
MapAction has been using these icons in many of its maps and converted the icons so that can be used in ArcGIS and QGIS.
These are “free for use”. Whenever possible please credit as follows: “Source: OCHA & MapAction”.