Year 30 (XXX) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Vinicius and Longinus (or, less frequently, year 783 Ab urbe condita). The denomination 30 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.

7.62 mm caliber is a nominal caliber used for a number of different cartridges. Historically, this class of cartridge was commonly known as .30 caliber, the Imperial unit equivalent, and was most commonly used for indicating a class of full power military main battle rifle (MBR) cartridges. The measurement equals 0.30 inches or 3 decimal lines, written .3″ and read as Three-Line.

Country Code: +30
International Call Prefix: 00
Trunk Prefix: none

A vertical service code or VSC is a special code dialed prior to (or instead of) a telephone number that engages some type of special telephone service. Typically preceded with an asterisk, or * (star), key on the touch tone keypad and colloquially referred to as star codes, most are two digits in length although, as more services are developed, those that use 2 or 3 as the first digit are sometimes three digits in length.

–30– has been traditionally used by journalists to indicate the end of a story. There are many theories about how the usage came into being,e.g. from that number's use in the 92 Code of telegraphic shorthand to signify the end of a transmission in the American Civil War era. In another theory, the "-30-" originated when stories were written in longhand; X marked the end of a sentence, XX the end of a paragraph, and XXX meant the end of a story. The Roman numerals XXX translate to 30.