Possibly means murder!
Added: That would be impossible to tell without identifying the police department, dispatch unit, state, city, jurisidiction, whether or not it is sheriffs, police, constables, etc. Each police department is different.
187 stands for murder, as defined in the California Penal Code.
187 IS THE STATUTE CODE FOR MURDER IN CALIFORNIA. WEARER IS CLAIMING TO HAVE COMMITTED A MURDER. Or he just thinks it's kewl to have the code for a murder engraved into his arm. This is especially entertaining on the arm of an 18-year-old whose "worldly travels" extend from North Carolina all the way to Myrtle Beach, SC.
187 is the police code for murder - it's a homicide show set in Detroit - Detroit 1-8-7.
The 187 code that originated in the California Penal Code is murder.
87 is a numeric code for the crime of murder. It is primarily used by law enforcement officials in the U.S. state of California-especially police, prosecutors, and judges.
The police code, 10-16, is for a domestic disturbance.
There is no standard radio "code" - they can vary greatly between departments and agencies. - - - - - - - In some places a 187 is a homicide. So 187 in progress would be homicide in progress.
gambling
According to the entry in Wikipedia, 187 is a numeric code for the crime of murder.
In what country?
Stay out of area.
The letter D