Secure telecommunications or information system, or associated cryptographic component, that is unclassified and handled through the COMSEC material control system (CMCS), an equivalent material control system, or a combination of the two that provides accountability and visibility. Such items are marked “Controlled Cryptographic Item”, or, where space is limited, “CCI”.
Sources:
CNSSI 4009-2015
from
NSA/CSS Manual Number 3-16 (COMSEC)