The number 7 is a natural number that follows 6 and precedes 8. It is an odd integer and is considered a prime number, as its only positive divisors are 1 and itself.

In 1958, several computer companies were disestablished or ceased operations due to various reasons, including mergers, acquisitions, or market changes. One notable example is **General Motors Research Laboratories' computer division**, which was integrated into other parts of the company or moved away from computer production. The landscape of the computer industry was rapidly evolving during this period, and many companies that could not keep pace with advancements or competition were forced to close.

A TXT record (Text Record) is a type of Resource Record in the Domain Name System (DNS) that allows the association of text-based information with a domain name. TXT records can store any arbitrary text string and are used primarily for providing additional information about a domain. Common uses for TXT records include: 1. **SPF (Sender Policy Framework)**: TXT records can specify which mail servers are permitted to send email on behalf of a domain, helping to combat email spoofing.

The term "service companies by year of disestablishment" generally refers to various service-oriented businesses that have ceased operations in specific years. This could encompass a wide range of industries such as hospitality, retail, banking, and technology. Unfortunately, there isn't a comprehensive list publicly available that categorizes service companies by their year of disestablishment, as it can vary greatly by region and sector.

Muirhead's Inequality is a powerful result in the field of inequalities and symmetric sums, often utilized in combinatorial and algebraic contexts. It addresses the relationship between symmetric sums of different kinds of sequences and provides a way to compare sums based on their symmetry types.

Gravitational acceleration is the acceleration experienced by an object due to the gravitational force exerted by a massive body, such as a planet or a star. It is commonly denoted by the symbol \( g \). On the surface of the Earth, the average value of gravitational acceleration is approximately \( 9.81 \, \text{m/s}^2 \).

A Top-Level Domain (TLD) is the last segment of a domain name, which is the part that follows the final dot. For instance, in the domain name "example.com," the TLD is ".com." TLDs are part of the Domain Name System (DNS) hierarchy and help categorize domain names.

A "sea lane" refers to a designated route or corridor used for maritime transportation, where ships travel to transport goods and passengers. These lanes are critical for international trade and are often heavily trafficked, as they connect major ports and economic regions. Key features of sea lanes include: 1. **Navigation Routes**: Sea lanes take advantage of the most efficient pathways through bodies of water, often considering factors like depth, currents, and navigational hazards.

In rally racing, a co-driver (also known as a navigator) is a crucial member of the racing team who assists the driver throughout the event. The primary responsibilities of a co-driver include: 1. **Navigation:** The co-driver reads and interprets pace notes, which are detailed descriptions of the rally stage's terrain and conditions. These notes help the driver anticipate turns, jumps, hazards, and other features of the course.

Tide tables are charts or tables that provide information about the times and heights of tides for specific locations over a period of time, usually represented monthly. Tides are the rise and fall of sea levels caused by the gravitational pull of the moon and the sun, and they can vary based on geographical location, time of year, and astronomical conditions. Tide tables typically include: 1. **Date**: The day of the month for which the tide information is relevant.

"As the crow flies" is an idiomatic expression that refers to the shortest distance between two points, measured in a straight line. It is often used in contrast to distances that follow the curvature of roads, paths, or other obstacles. The phrase suggests a direct, unobstructed route, much like how a crow would fly straight from one location to another, rather than navigating around barriers that humans might encounter. This expression is commonly used in geography, travel, and navigation contexts.

The division sign is a mathematical symbol used to represent the operation of division. It is commonly depicted in two ways: 1. **Obelus (÷)**: This is the most recognizable division symbol, often used in elementary mathematics. For example, the expression \( 6 ÷ 2 \) denotes that 6 is divided by 2. 2. **Slash (/)**: This symbol is frequently used in more advanced mathematics and programming contexts.

Depth sounding is a surveying technique used to determine the depth of a body of water, such as a lake, river, or ocean. It involves measuring the vertical distance from the water's surface to the bottom. This technique is crucial for various applications, including navigation, marine construction, fishing, and environmental studies.

"Distances Between Ports" typically refers to the measurement of the distance between two or more maritime ports. This information is crucial for various reasons, including: 1. **Shipping and Logistics**: Knowing the distance between ports is vital for shipping companies to plan their routes, calculate fuel costs, and estimate shipping times. 2. **Trade and Commerce**: Distances can affect trade agreements, shipping costs, and market accessibility. Ports that are closer together may facilitate more regular shipping routes and lower costs.

Traffic Separation Schemes (TSS) are designated sea routes that help manage maritime traffic and enhance safety by separating opposing flows of vessels. These schemes are particularly important in busy shipping lanes and areas where vessel traffic is heavy. They are established by international maritime authorities, such as the International Maritime Organization (IMO), and are marked on nautical charts.

The product integral is a mathematical concept that is used as a continuous counterpart to the discrete product. Just as the sum of a series can be represented as a definite integral (the Riemann integral), the product of a sequence can be represented using a product integral.

Loxodromic navigation, also known as rhumb-line navigation, refers to a method of navigating across the Earth's surface by following a path that crosses all meridians at the same angle. This type of navigation is particularly useful for sea and air travel because it simplifies course plotting and allows for constant compass reading. When a vessel follows a loxodrome, it appears as a straight line on a Mercator projection map.

Marine navigation is the process of planning and directing the course of a vessel through water bodies such as oceans, rivers, and lakes. It involves utilizing various techniques, tools, and technologies to determine the vessel's position, chart a safe route, avoid hazards, and reach a specific destination efficiently and safely.

A nautical measured mile is a specific distance used in maritime navigation and testing that precisely equals one nautical mile, which is approximately 1.15078 statute miles or 1,852 meters. The nautical mile is based on the circumference of the Earth and is defined as one minute of latitude. In practical terms, a nautical measured mile is often used to calibrate instruments, conduct speed trials for vessels, or establish a standard distance for navigation.

The Northern Sea Route (NSR) is a shipping route that runs along the northern coast of Russia, connecting the Atlantic and Pacific Oceans. It primarily navigates through the Arctic Ocean and includes various straits and channels, allowing vessels to travel between Europe and Asia without needing to go through traditional routes like the Suez Canal.