Due to the legitimate role that referees play in wrestling of serving as liaison between the bookers backstage and the wrestlers in the ring (the role of being a final arbitrator is merely kayfabe), the referee is present, even in matches that do not at first glance appear to require a referee (such as a ladder match, as it is no holds barred, and the criteria for victory could theoretically be assessed from afar). Although their actions are also frequently scripted for dramatic effect, referees are subject to certain general rules and requirements in order to maintain the theatrical appearance of unbiased authority. The most basic rule is that an action must be seen by a referee to be declared for a fall or disqualification. This allows for heel characters to gain a scripted advantage by distracting or disabling the referee in order to perform some ostensibly illegal maneuver on their opponent. Most referees are unnamed and essentially anonymous, though the WWE has let their officials reveal their names.
What are referees called?
Most referees are unnamed and essentially anonymous, though the WWE has let their officials reveal their names.

The Illuminating Engineering Society of North America (IESNA), in conjunction with organizations like ANSI and ASHRAE, publishes guidelines, standards, and handbooks that allow categorization of the illumination needs of different built environments. Manufacturers of lighting equipment publish photometric data for their products, which defines the distribution of light released by a specific luminaire. This data is typically expressed in standardized form defined by the IESNA.
What does the IESNA stand for? 
The Illuminating Engineering Society of North America

Asphalt/bitumen can sometimes be confused with "coal tar", which is a visually similar black, thermoplastic material produced by the destructive distillation of coal. During the early and mid-20th century when town gas was produced, coal tar was a readily available byproduct and extensively used as the binder for road aggregates. The addition of tar to macadam roads led to the word tarmac, which is now used in common parlance to refer to road-making materials. However, since the 1970s, when natural gas succeeded town gas, asphalt/bitumen has completely overtaken the use of coal tar in these applications. Other examples of this confusion include the La Brea Tar Pits and the Canadian oil sands, both of which actually contain natural bitumen rather than tar. Pitch is another term sometimes used at times to refer to asphalt/bitumen, as in Pitch Lake.
What use has pushed out the need to produce roads with coal tar?
natural gas