R Scientific & Educational Abbreviation

Returning

Red

Designation applied to an information system, and associated areas, circuits, components, and equipment in which unencrypted national security information is being processed.

Reach

Distance that an excavator arm can extend. A stream section with fairly homogenous characteristics. REACH is the system for Registration, Evaluation and Assessment of Chemicals being proposed under the EU Chemicals Policy.

Rollicking

Route

Consecutive links in a network served by single flight numbers, eg QF1 operates SYD/BKK/LHR as a single route. The path that network traffic follows from its source to its destination. also cut-through. The URL used to direct requests to an application. A route is made up of an optional host and a domain that are specified when an application is pushed. For example, in the route myapp.example.com, myapp is the host and example.com is the domain.

Reserve

That portion of the demonstrated reserve base that is estimated to be recoverable at the time of determination. The reserve is derived by applying a recovery factor to that component of the identified coal resource designated as the demonstrated reserve base. Portion of a body of troops that is kept to the rear, or withheld from action at the beginning of an engagement, in order to be available for a decisive movement. Members of the uniformed Services who are not in active service but who are subject to call to active duty.

Random

Eluding precise prediction, completely irregular.

Rose

Name given to a compass card, or other diagram, having radiating lines.

Roentgen

Roentgen is a unit of measurement for the amount of ionizing radiation that produces 2.1 x 10^9 units of charge in 1 cm³ of air at STP. In SI units, 1 Roentgen (R) = 2.58 x 10^-4 C/kg.

Ray

One of a family of lines (rays) used to represent the propagation of an electromagnetic wave; most useful in real media when the wave amplitude varies slowly compared to the wavelength (geometrical optics).OR  A half-line. Continues forever in one direction. Has one endpoint.