1. Brick: It is a hard-fired brick used in construction, often for pavements and walls.
2. Clinker: It refers to the fused, non-combustible residue left after the burning of coal or other fuels. It is often used in construction as a lightweight aggregate or as a road-building material.
3. Ringing Sound: In some regions of Germany, "klinker" can also be used to describe a ringing or clinking sound.
Please note that the context will usually make clear which meaning is intended.