The English word "clergy" derives from the same root as "clerk" and can be traced to the Latin "clericus" which derives from the Greek word "kleros" meaning a "lot" or "portion" or "office". The term Clerk in Holy Orders is still the technical title for certain Christian clergy, and its usage is prevalent in canon law. Holy Orders refer to any recipient of the Sacrament of Ordination, both the Major Orders (bishops, priests and deacons) and the now less known Minor Orders (Acolyte, Lector, Exorcist and Porter) who, save for certain reforms made at the Second Vatican Council in the Roman Catholic Church, were called clerics or "Clerk", which is simply a shorter form of "Cleric". Clerics were distinguished from the laity by having received, in a formal rite of introduction into the clerical state, the "tonsure" or "corona" (crown) which involved cutting hair from the top and side of the head leaving a circlet of hair which symbolised the "Crown of Thorns" worn by Christ at His crucifixion.