National day of mourning
Flying a national or military flag of that country at half-mast is a common symbol.Sociologically, period of national mourning are understood "as instituting states of social exception during which state authorities enact ritual actions consisting in a sequence of choreographically staged performative acts meant to create a national community of grief in the face of what is framed as a socially meaningful loss."[1][2][3] The following are lists for national days of mourning across the world: A similar but rarely-used concept exists at the European Union-level and Arab League-level and are called a European Day of Mourning and Arab League Day of Mourning.The European Commission first introduced the concept on 12 September 2001, when a day of mourning was declared across EU member states for the victims of the September 11 terrorist attacks in the United States.[12][13] Arab League has declared days of mourning for four times until October 2023.