In ecclesiastical use, this refers to someone who belongs to the Roman Catholic Church, considered the largest of the Christian sects.
In non-ecclesiastical use, it derives its English meaning directly from its root, and is currently used to mean the following:
- including a wide variety of things, or all-embracing
- universal or of general interest
- having broad interests, or wide sympathies
- inclusive, inviting
Obviously, this tag refers to the first definition. The easiest Catholics to identify are the nuns since they wear black habits. Priests can either wear the cassock or a set of robes for their sermons. The best identifier of a Catholic priest is a crucifix, since just wearing a stole over their robes isn't enough of an indicator of what their beliefs are.