Bachelor's degree
Until the 19th century, a bachelor's degree represented the first degree in a particular faculty, with Arts representing undergraduate study, thus the Bachelor of Civil Law (BCL) at Oxford and the Bachelor of Laws (LLB) at Cambridge, for example, were postgraduate degrees. Vestiges of this system still remain in the ancient universities, with Oxford and Cambridge awarding BAs for undergraduate degrees in both arts and sciences (although both award undergraduate BTh degrees through associated theological colleges, and Oxford awards BFA degrees in addition to the BA) and defining other bachelor's degrees (e.g. BPhil, BCL) as postgraduate awards equivalent to master's degrees, although many postgraduate bachelor's degrees have now been replaced by equivalent master's degrees (e.g. LLM for the LLB at Cambridge and MSc for the BSc at Oxford). The same historical usage of indicating an undergraduate degree by it being in the faculty of arts rather than being a bachelor's degree gives rise to the Oxbridge MA and the Scottish MA).
Bachelor of Arts
A Bachelor of Arts is entitled to the designation B.A. for an ordinary/pass degree and B.A. (Hons) for an honours degree. Students who completed an honours B.A. sometimes style themselves by '(Hon)' or '(Hons)' after the degree abbreviation in parentheses. An honours degree is always awarded in one of four classes depending upon the marks gained in the final assessments and examinations. The top students are awarded a first-class degree, followed by an upper second-class degree (usually referred to as a 2:1), a lower second-class degree (usually referred to as a 2:2), and those with the lowest marks gain a third-class degree. An ordinary or unclassified degree (which does not give the graduate the right to add '(Hons)') may be awarded if a student has completed the full honours degree course but has not obtained the total required passes sufficient to merit a third-class honours degree. Typically these degrees lack the last year requirement of a dissertation.