In forums I always see the acronym RCC tossed about. Sometimes it is done in innocence, but very often it is done out of malice by people who know better, or out of sheer ignorance.
The Catholic Church is the "Catholic Church", not the
Roman Catholic Church. Within the Catholic Church, there are many "Rites": The Maronite Rite, the Syriac Rite, the Chaldean Rite, the Byzantine Rite, and many many other "Rites" or
Churches, and also included is the Latin Rite, or "Roman" rite if you will. The Roman Catholic Church is a part of the Catholic Church, but that is all.
What all these Churches - or "Rites" - have in common is doctrine, and submission to the Pope as the Successor of Peter and earthly head of the Church. Not all Catholics are "Latin Rite" Catholics though, and some Catholics can find it rather offensive when the Church is continually referred to as the RCC.
What does this say:
It says "Catechism of the Catholic Church". It does not say "Catechism of the Roman Catholic Church". That is an important point to remember.
RITES
A Rite represents an ecclesiastical, or church, tradition about how the sacraments are to be celebrated. Each of the sacraments has at its core an essential nature which must be satisfied for the sacrament to be confected or realized. This essence – of matter, form and intention – derives from the divinely revealed nature of the particular sacrament. It cannot be changed by the Church. Scripture and Sacred Tradition, as interpreted by the Magisterium, tells us what is essential in each of the sacraments (2 Thes. 2:15).
When the apostles brought the Gospel to the major cultural centers of their day the essential elements of religious practice were inculturated into those cultures. This means that the essential elements were clothed in the symbols and trappings of the particular people, so that the rituals conveyed the desired spiritual meaning to that culture. In this way the Church becomes all things to all men that some might be saved (1 Cor. 9:22).
There are three major groupings of Rites based on this initial transmission of the faith, the Roman, the Antiochian (Syria) and the Alexandrian (Egypt). Later on the Byzantine derived as a major Rite from the Antiochian, under the influence of St. Basil and St. John Chrysostom. From these four derive the over 20 liturgical Rites present in the Church today.
source:
Catholic Rites and Churches
For those who mean no malice when using "RCC", I wanted to make this point for your benefit. For the one who do it out of malice, you are revealed.