It is two abbreviations combined. Its full name is International Criminal Police Organization. From that, International and Police are partially used to get Interpol.
If you are talking about the police (here in south africa) the rank after constable is a sergeant.
there is no police rank equivalent to indian army captain!
Police constable
corporal police officer is the first rank of the police department.
It is spelled sergeant (a non-commissioned military rank, or senior policeman).
The equivalent rank of Lt Colonel in the Police is a Supdt of Police in the District or a Deputy Commissioner of Police in any of the Metro cities
constable is a rank in the police forces, usually its the first full rank after graduation as a police officer and completion of a probationary period.
top rank. you cant get any higher.
Warrant officer of indian air force is equivalent to sub inspector of police in rank but not as portfolio
Ask them.
SP of police.