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.
Proctor, a variant of procurator, is a person who takes charge of, or acts for, another. The word proctor is frequently used to describe someone who oversees an examination or dormitory. The title is used in England in three principal contexts: In law, a proctor is an attorney or solicitor acting in some courts. In religion, a proctor represents the clergy in Church of England dioceses. In education, a proctor is the name of university officials in certain universities, or a supervisor or invigilator during an exam.