The "Unknown Soldier" refers to a military burial that honors unidentified soldiers who died in battle. This concept symbolizes the sacrifices made by all service members, particularly those whose identities remain unknown. Many countries have dedicated memorials or tombs for these soldiers, emphasizing the collective grief and respect for those who served. One of the most famous examples is the Tomb of the Unknown Soldier in Arlington National Cemetery, which was established in 1921. This site serves as a tribute to American soldiers who lost their lives in various conflicts, representing the bravery and dedication of all military personnel.