Police ranks in the United Kingdom

A constable is a person holding a particular office, most commonly in law enforcement. The office of constable can vary significantly in different jurisdictions. Constable is commonly the rank of an officer within a police service. Other people may be granted powers of a constable without holding this title.

Commander (commonly abbreviated as Cdr.) is a common naval officer rank as well as a job title in many armies. Commander is also used as a level 8 rank or title in other formal organizations, including several police forces. In several countries, this naval rank is termed as a frigate captain.

Inspector, also police inspector or inspector of police, is a police rank. The rank or position varies in seniority depending on the organization that uses it.

rank in British police services and in most English-speaking Commonwealth nations

Police force rank

Sub-inspector (SI), or sub-inspector of police or police sub-inspector (PSI), is a rank used extensively in South Asia: in the police forces of Bangladesh, Pakistan, India, and Sri Lanka, which are primarily based on the British model. It was formerly used in most British colonial police forces and in certain British police forces as well. The rank usually was in charge of a police substation or assisted an inspector.

system of hierarchical relationships in police organisations

police officer rank

senior police force rank