Biquaternions extend the concept of quaternions to include a second imaginary unit, often denoted as \( j \), in addition to the standard quaternion imaginary unit \( i \).

Bird's eye extinction, or the "bird's-eye view" extinction, is not a widely recognized term in ecology or evolutionary biology. However, it may refer to certain ecological concepts where the extinction of species is viewed from a broader perspective, emphasizing how human activity and environmental changes affect entire ecosystems rather than just individual species.

In computing, a "blacklist" is a list of entities that are denied access to a particular system, service, or network. The term is commonly used in various contexts, including: 1. **Network Security**: In cybersecurity, a blacklist may refer to IP addresses, domain names, or email addresses that are known to be involved in malicious activities, such as spam or hacking attempts. Firewalls and security software can use blacklists to block incoming or outgoing traffic from these sources.

A Walkalong Glider is a type of toy or educational device that demonstrates principles of flight and aerodynamics using simple physics. It typically consists of a lightweight glider that can be controlled and kept aloft by manipulating a stream of air from a handheld fan or other air source. The name "walkalong" refers to the way the user can walk alongside the glider while keeping it airborne.

Geographic Object Identifiers (GOIs) are a type of identifier used to uniquely reference geographic entities or objects in a systematic and standardized way. While "Geographic Object Identifiers" as a specific term may not have a widely recognized definition across all disciplines, it generally refers to identifiers that help in the organization, retrieval, and management of geographic data in geographic information systems (GIS) and related fields.

"Blood rain" refers to a phenomenon where rain appears red or brown due to the presence of certain particles or microorganisms. This unusual occurrence can be caused by a variety of factors: 1. **Dust or Soil Particles**: When strong winds carry red dust or soil particles into the atmosphere, these can mix with rain clouds. When it rains, the dust can fall along with the water, giving the appearance of red rain.

Children's railways, often referred to as "miniature railways" or "child-friendly railways," are railways designed specifically for children, providing a fun and educational experience. These railways are typically smaller in scale compared to regular railways and often feature miniature train sets that are safe for children to ride. Here are some key characteristics: 1. **Educational Purpose**: Many children's railways aim to teach kids about trains, engineering, and the basics of how railways operate.

The NRF51 series refers to a family of low-power System-on-Chip (SoC) devices developed by Nordic Semiconductor. These SoCs are primarily designed for Bluetooth Low Energy (BLE) applications but can also support other wireless protocols. The NRF51 series is based on a 32-bit ARM Cortex-M0 processor and is known for its energy efficiency, making it well-suited for battery-operated devices.

An Optical Cross-Connect (OXC) is a device used in optical networks to manage and route optical signals without the need to convert them into electrical signals. This capability allows for the efficient and flexible management of bandwidth and connectivity in high-capacity networks. ### Key Features of Optical Cross-Connects: 1. **Wavelength Routing**: OXCs can switch different wavelengths of light (channels) across fiber optic cables, directing them to various destinations in the network.

All Partners Access Network (APAN) is a collaborative platform that facilitates communication, information sharing, and cooperation among a wide range of partners, including governmental organizations, private sector companies, and academic institutions. APAN primarily aims to enhance interoperability and facilitate the exchange of information, particularly in areas such as defense, security, and disaster response. The network provides tools and resources that enable members to share documents, data, and knowledge, fostering a cooperative environment for addressing challenges and leveraging opportunities collectively.

The Deputy Chief of Staff G-8 (Programs) of the United States Army is a key position within the Army staff, responsible for overseeing the planning, programming, and budgeting of Army programs and resources. The G-8 plays a critical role in the Army's Program Objective Memorandum (POM) process, which includes assessing requirements, establishing priorities, and allocating resources to meet the Army's strategic goals.

A glossary of military modeling and simulation typically includes terms, definitions, and concepts related to the practices and techniques used in simulating military operations, training, and analysis. Below are some key terms commonly found in such a glossary: ### A - **After Action Review (AAR)**: A process for reflecting on and discussing the events and actions following an exercise or operation to identify lessons learned.

The Institute for Creative Technologies (ICT) is a research institute located at the University of Southern California (USC). Established in 1999, it focuses on advancing the fields of interactive technologies, computer graphics, and immersive experiences. ICT's primary mission is to develop innovative technologies that can be applied to various areas, including education, training, entertainment, and healthcare.

SIMPLE (SIP for Instant Messaging and Presence Leveraging Extensions) is a protocol that was developed to facilitate instant messaging and presence information in military communications. It is based on the Session Initiation Protocol (SIP), a signaling protocol used for initiating, maintaining, and terminating real-time sessions that include voice, video, and messaging applications. Key features of SIMPLE include: 1. **Instant Messaging**: SIMPLE supports real-time text communication, allowing users to send and receive messages almost instantly.

Test and Training Enabling Architecture (TTEA) is a set of standards and specifications designed to facilitate the integration and interoperability of various testing and training systems within military and defense environments. TTEA aims to improve the effectiveness and efficiency of training exercises and evaluations by enabling seamless communication and data sharing among different platforms and systems. The architecture allows various models, simulations, and live training systems to operate together, providing a more realistic and cohesive training environment. This integration supports enhanced decision-making and operational readiness.

The United States Army Aviation and Missile Center (AMCOM) is a vital component of the U.S. Army that focuses on research, development, testing, and logistics for aviation and missile systems. Its primary mission is to enhance the Army's aviation and missile capabilities through advanced technology and systems integration. Located at the Redstone Arsenal in Huntsville, Alabama, AMCOM oversees a wide range of programs related to aircraft, helicopters, missiles, rockets, and unmanned aerial vehicles (UAVs).

The United States Army Combat Capabilities Development Command (CCDC) Armaments Center, formerly known as the Armament Research, Development and Engineering Center (ARDEC), is a key component of the Army's modernization and development efforts. Located primarily at Picatinny Arsenal in New Jersey, the CCDC Armaments Center focuses on the research, development, and engineering of armament systems and munitions.

The term "3B series computers" refers to a line of minicomputers produced by the American company AT&T (American Telephone and Telegraph Company). The 3B series was notable for its use in various computing applications, particularly in telecommunications, and it was part of AT&T's efforts to diversify beyond traditional telephone services in the late 1970s and 1980s.