A Principal Meridian is a fundamental reference line used in the Public Land Survey System (PLSS) in the United States. The PLSS is a method for surveying and categorizing land to facilitate property ownership and land management. The Principal Meridian serves as a starting point for defining the township and range system used in the PLSS. Each Principal Meridian is associated with a specific geographic area and is typically accompanied by a Baseline, which runs perpendicular to it.

In the context of matrices, the term "balanced matrix" can refer to a few different concepts depending on the specific field of study: 1. **Statistical Balanced Matrices**: In statistics, particularly in experimental design, a balanced matrix often refers to a design matrix where each level of the factors has the same number of observations. This ensures that the estimates of the effects are not biased due to unequal representation.

A double planetoid is a celestial body that consists of two objects that are gravitationally bound to each other, typically of similar size. These objects orbit around their common center of mass, which is located outside of either object if they are of comparable size. Double planetoids can also be considered a subtype of binary systems, specifically in the category of small Solar System bodies such as asteroids or Kuiper Belt objects.

The balanced polygamma function is a generalization of the classical polygamma function, which is itself the derivative of the logarithm of the gamma function.

The Puppe sequence specifically refers to a numerical sequence mentioned in various mathematical discussions, although it might not be widely recognized or defined in mainstream mathematics.

Balanced ternary is a numeral system that uses three digits: -1, 0, and 1. Unlike the traditional ternary (base-3) system that uses the digits 0, 1, and 2, balanced ternary represents numbers in a way that allows for a balanced representation around zero.

The Banana Equivalent Dose (BED) is a humorous and insightful way to illustrate the concept of radioactivity and radiation exposure by comparing it to the radiation exposure one would receive from eating bananas. Bananas contain potassium-40, a naturally occurring radioactive isotope of potassium. The BED is often used to provide context for understanding the levels of radiation exposure from various sources, including natural background radiation and medical procedures. A common estimate is that eating one banana exposes a person to about 0.

Ball lightning is a rare and poorly understood atmospheric phenomenon that appears as glowing, spherical objects, typically ranging in size from a few centimeters to several meters in diameter. These spheres can last for a few seconds to several minutes and can display different colors, usually red, orange, or yellow. Reports of ball lightning often occur during thunderstorms, and witnesses have described it moving erratically through the air, passing through windows, and even following people.

"Balloons" is a song by the American musical project *The Casket Girls*, released as part of their album "The Casket Girls" in 2013. The song features a blend of dream pop and synth-pop elements, characterized by ethereal vocals, atmospheric instrumentation, and introspective lyrics.

The Banach fixed-point theorem, also known as the contraction mapping theorem, is a fundamental result in fixed-point theory within the field of analysis.

Domino tiling is a mathematical concept that involves covering a given area (usually a rectangular region) with dominoes, where a domino is a rectangular piece that covers two adjacent unit squares. In the context of combinatorial mathematics and theoretical computer science, domino tilings are often explored in relation to various problems such as counting configurations, studying combinatorial effects, and examining properties of different types of grids.

Donald A. S. Fraser is a notable figure primarily recognized for his work in the field of economics, particularly concerning global development and public policy. He has made significant contributions through his writings and research on topics such as trade, governance, and economic growth. However, without further context, it's unclear which specific Donald A. S.

Donemus is a Dutch music publishing company that specializes in the promotion and licensing of contemporary classical music. It serves as a platform for composers to share their works, providing access to a catalog of scores and facilitating performances. Donemus plays a crucial role in supporting composers, helping them with the distribution of their music, and connecting them with performers and ensembles. The organization often collaborates with various artists and institutions to promote new music and encourage innovative projects in the field of classical music.

Dorothy P. Rice is a notable figure in the field of public health and epidemiology, particularly recognized for her contributions to health statistics and research methods. She is known for her work on health disparities, particularly those affecting older adults, and has played a significant role in advancing our understanding of health data collection and analysis. Her research often focuses on topics like the aging process, access to healthcare, and the social determinants of health.

The Dose-Fractionation Theorem is a principle used primarily in the field of radiotherapy, particularly in the treatment of cancer. The theorem pertains to how radiation dosage can be fractionated, meaning that the total dose of radiation is divided into smaller, more manageable doses (fractions) administered over a period of time. This approach is based on the understanding that cancer cells and normal cells respond differently to radiation.

Emil Cioran was a Romanian philosopher, essayist, and memoirist, born on April 8, 1911, in Rășinari, Romania, and died on June 20, 1995, in Paris, France. He is known for his profound pessimism and existential thought, often reflecting on themes such as despair, the nature of existence, and the futility of life.

Douglas 2229 refers to a specific genetic mutation in the *Drosophila melanogaster* species, commonly known as the fruit fly. It is notable for its association with certain phenotypic characteristics, particularly in the context of research related to genetics and developmental biology. The designation "Douglas" often denotes the name of the researcher or lab associated with the discovery or study of this mutation.

Whole body imaging refers to a range of imaging techniques that provide a comprehensive view of the entire body, allowing for the assessment of various conditions and diseases across multiple organs and systems. It is commonly used in medical diagnostics, research, and therapeutic planning. The primary imaging modalities used for whole body imaging include: 1. **Computed Tomography (CT) Scans**: CT scans can provide cross-sectional images of the body and are often used to identify and monitor tumors, infections, or other medical conditions.