1) Dire hospital area 2) EKG site 
<abbreviation> Coronary care unit; critical care unit. ... (05 Mar 2000) ... 
critical care unit; see intensive care unit.
A Critical Care Unit is a specialised unit within a hospital. It provides continuous monitoring and treatment for people who need acute care.Coronary Care Unit
Coronary Care UnitCritical care unit (differs as at some hospitals is coronary care unit)
Cryptographic Control Unit
Type: Abbreviation Definitions: 1. Abbreviation for coronary care unit; critical care unit.
A CCU (Communications Concentrator Unit) is a small computer connected between a main computer and one or more serial devices operating as an intermediary to relieve the main computer of much of the routine work connected with receiving information from the serial devices.
Correctional Custody Unit, a hard-labor and heavy discipline unit overseen by MPs or Navy Masters-at-Arms to which Marines and Sailors found guilty of minor UCMJ offenses through NJP are sent for up to 30 days in lieu of confinement in the brig.
Coronary Care UnitCritical Care Unit
Central Control Unit
Central Control Unit