Sluis 0

Sluis 0 (Dutch for Lock 0) refers to a hypothetical or fictional lock, often used in nautical contexts, typically situated at the beginning of a canal or waterway system. The concept of "Sluis 0" can be used metaphorically to represent the starting point of a process, project, or journey, implying an entry point before any numbered locks are encountered. It suggests a pre-existing, or perhaps unnumbered, access point to a larger navigable system. In some instances, it might represent an initial, often conceptual, barrier or gate that must be passed to enter a system. The term is more frequently used informally than as a formal, documented navigational feature.