The boundary of a convex set is always a convex curve. The intersection of all convex sets containing a given subset A of Euclidean space is called the convex hull of A. It is the smallest convex set containing A.
Rector (ecclesiastical) A rector is, in an ecclesiastical sense, a cleric who functions as an administrative leader in some Christian denominations, and in Islam. In contrast, a vicar is also a cleric but functions as an assistant and representative of an administrative leader.
General notions. A parish is a portion of a diocese under the authority of a priest legitimately appointed to secure in virtue of his office for the faithful dwelling therein, the helps of religion. The faithful are called parishioners, the priest parochus, curate, parish priest, pastor.