The term 'rule' can refer to a variety of different concepts, including tests, axioms, lines, guides, heads, standards, asas, gags, mobs, laws, norms, sways, slides, bylaws, reigns, decides, governs, ofthumbs, precepts, regimens, statutes, dominates, holdsways, and guidelines. A TEST is an assessment used to measure knowledge or skills, while an AXIOM is a self-evident truth. A LINE is a mark that divides two areas, and a GUIDE is a person or thing that helps direct someone. A HEAD is the topmost part of something, and a STANDARD is a level of quality or attainment. An ASA is a type of African antelope, while a GAG is a joke or trick. A MOB is a large group of people, and a LAW is a rule of conduct. A NORM is a STANDARD of behavior, and a SWAY is a type of movement. A SLIDE is a type of playground equipment, and a BYLAW is a local ordinance. REIGN is the period of time during which a ruler is in power, and DECIDE is to make a choice. GOVERN is to exercise authority over, and ofthumb is a rule of thumb. PRECEPT is a principle or rule of conduct, and REGIMEN is a system of rules. STATUTE is a LAW enacted by a legislature, and DOMINATE is to have control over. Holdsway is a form of influence, and GUIDELINE is a rule or principle that provides guidance.