Merlons are the solid, upright sections of a battlement, which is a defensive architectural feature commonly found on castles and fortifications. They alternate with the openings called crenels, allowing defenders to shield themselves while shooting arrows or other projectiles at attackers. Merlons provide both protection and a strategic advantage during sieges. Typically made of stone or brick, merlons can vary in height and design, reflecting the style of the period in which they were built. They are often seen in medieval architecture, symbolizing strength and security. The presence of merlons contributes to the iconic silhouette of a castle or fortress.