1. Parapet: The parapet is the raised earth or sandbagged wall at the front of the trench. It provides cover from enemy fire and can be used as a firing position.
2. Trench floor: The trench floor is the level surface at the bottom of the trench. It is usually made of compacted earth, sand, or wood planks.
3. Trench wall: The trench walls are the vertical sides of the trench. They can be reinforced with sandbags, logs, or other materials to prevent them from collapsing.
4. Steps/Duckboards: Steps or duckboards are used to enter and exit the trench as well as to move along the trench. They are usually made of wood or metal and are placed in the floor of the trench.
5. Communication trench: A communication trench is a narrow trench that runs perpendicular to the main trench. It allows soldiers to move between trenches without being exposed to enemy fire.
6. Firebay: A firebay is a section of trench that is widened to allow for a wider field of fire. It is usually located at strategic points in the trench system.
7. Overhead cover: Overhead cover is any material placed over the trench to provide protection from enemy fire. This can include sandbags, logs, or corrugated iron.
8. Bomb shelter: A bomb shelter is a covered area within the trench system that provides protection from artillery fire. It is usually reinforced with concrete or sandbags.
9. Drainage system: A drainage system is a network of pipes or ditches that removes water from the trench. This prevents the trench from becoming flooded and unsanitary.
10. Latrine: A latrine is a toilet facility within the trench system. It is usually a simple pit dug in the ground.