Wall

Wall is an item in the Factorio product category used as a defensive-structure component; it stacks up to 100 per inventory slot and is placed by the player to create solid barriers that block or impede enemy movement and projectiles. As a core building material for base defense, Wall is consumed when constructing continuous segments of fortification and interacts with other defensive entities and repair systems to maintain perimeter integrity. The item itself is identified in-game as Wall and functions purely as a buildable defensive block within the game's construction and combat systems.