Remembrance Sunday is a day of solemn remembrance for those who have died in conflict. There are several synonyms that can be used to describe this important occasion, including Armistice Day, Veterans Day, and Poppy Day. Armistice Day is the anniversary of the end of World War I, which is marked by a two-minute silence on the 11th hour of the 11th day of the 11th month. Veterans Day is observed in the United States to honor all military veterans who have served in the country's armed forces. Poppy Day is a term used in Commonwealth countries to describe the sale of poppies as a symbol of remembrance and support for veterans.