What rank is STO.1?

STO.1, or "Standard Operating Procedure 1," typically refers to a specific protocol or guideline within an organization, and its ranking can vary depending on the context in which it is used. Without additional context regarding the specific organization or field (such as military, corporate, or medical), it is difficult to determine its exact rank or importance. Generally, it may represent a foundational or primary procedure that guides subsequent actions or policies.