slingshot, 投石器

Student demonstrators use a slingshot to throw rocks at police during a protest against Venezuelan President Nicolas Maduro's government in San Cristobal, Venezuela, March 10, 2016. (Photo by Carlos Eduardo Ramirez/Reuters)
The Day in Photos – March 18, 2016
http://avax.news/fact/The_Day_in_Photos_March_18_2016.html