Year 8 (VIII) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Camillus and Quinctilianus (or, less frequently, 761 Ab urbe condita). The denomination 8 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

8 (eight ) is the natural number following 7 and preceding 9.

Classless Inter-Domain Routing (CIDR, or ) is a method for allocating IP addresses and routing Internet Protocol packets. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous addressing architecture of classful network design in the Internet. Its goal was to slow the growth of routing tables on routers across the Internet, and to help slow the rapid exhaustion of IPv4 addresses.

An emoticon ( or ), etymologically a portmanteau of emotion and icon, is a metacommunicative pictorial representation of a facial expression that, in the absence of body language and prosody, serves to draw a receiver's attention to the tenor or temper of a sender's nominal non-verbal communication, changing and improving its interpretation. It expresses — usually by means of punctuation marks (though it can include numbers and letters) — a person's feelings or mood, though as emoticons have become more popular, some devices have provided stylized pictures that do not use punctuation.

Emotion, in everyday speech, is any relatively brief conscious experience characterized by intense mental activity and a high degree of pleasure or displeasure. Scientific discourse has drifted to other meanings and there is no consensus on a definition. Emotion is often intertwined with mood, temperament, personality, disposition, and motivation. In some theories, cognition is an important aspect of emotion. Those acting primarily on emotion may seem as if they are not thinking, but mental processes are still essential, particularly in the interpretation of events. For example, the realization of danger and subsequent arousal of the nervous system (e.g. rapid heartbeat and breathing, sweating, muscle tension) is integral to the experience of fear. Other theories, however, claim that emotion is separate from and can precede cognition.

In mathematics, the affinely extended real number system is obtained from the real number system by adding two elements: and (read as positive infinity and negative infinity respectively). These new elements are not real numbers. It is useful in describing various limiting behaviors in calculus and mathematical analysis, especially in the theory of measure and integration. The affinely extended real number system is denoted or or .

The infinity symbol (sometimes called the lemniscate) is a mathematical symbol representing the concept of infinity.

Plus 8 (also spelled as Plus8, without the space) is a Canadian techno record label, based in Windsor, Ontario and founded in 1990 by DJs Richie Hawtin and John Acquaviva. Initial releases were by the pair themselves and their friends, using aliases such as States of Mind and Cybersonik, along with other Detroit-based musicians such as Kenny Larkin. Along with Underground Resistance and Planet E, Plus 8 was one of the vanguards of Detroit Techno's 'Second Wave', capitalising on the vacuum left by labels such as KMS, Metroplex and Transmat at the start of the 1990s.

Unicode has subscripted and superscripted versions of a number of characters including a full set of arabic numerals. These characters allow any polynomial,  chemical and certain other equations to be represented in plain text without using any form of markup like HTML or TeX.