1.
Lambda
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Lambda is the 11th letter of the Greek alphabet. In the system of Greek numerals lambda has a value of 30, Lambda is related to the Phoenician letter Lamed. Letters in other alphabets that stemmed from lambda include the Latin L, the ancient grammarians and dramatists give evidence to the pronunciation as in Classical Greek times. In Modern Greek the name of the letter, Λάμδα, is pronounced, in early Greek alphabets, the shape and orientation of lambda varied. Most variants consisted of two strokes, one longer than the other, connected at their ends. The angle might be in the upper-left, lower-left, or top, other variants had a vertical line with a horizontal or sloped stroke running to the right. With the general adoption of the Ionic alphabet, Greek settled on an angle at the top, the HTML4 character entity references for the Greek capital and small letter lambda are Λ, and λ, respectively. The Unicode code points for lambda are U+039B and U+03BB, the lambda particle is a type of subatomic particle in subatomic particle physics. Lambda is the set of axioms in the axiomatic method of logical deduction in first-order logic. Lambda was used as a pattern by the Spartan army. This stood for Lacedaemon, the name of the polis of the Spartans, Lambda is the von Mangoldt function in mathematical number theory. Lambda is a associated with the Identitarian movement, intended to emulate a Spartan shield pattern. In statistics, Wilkss lambda is used in analysis of variance to compare group means on a combination of dependent variables. In the spectral decomposition of matrices, lambda indicates the diagonal matrix of the eigenvalues of the matrix, in computer science, lambda is the time window over which a process is observed for determining the working memory set for a digital computers virtual memory management. In astrophysics, lambda represents the likelihood that a body will encounter a planet or a dwarf planet leading to a deflection of a significant magnitude. An object with a value of lambda is expected to have cleared its neighborhood. In crystal optics, lambda is used to represent the period of a lattice, in NATO military operations, a chevron is painted on the vehicles of this military alliance for identification. In chemistry there are Δ and Λ isomers, see, coordination complex In electrochemistry, in cosmology, lambda is the symbol for the cosmological constant, a term added to some dynamical equations to account for the acceleration of the universe

2.
Logical conjunction
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In logic and mathematics, and is the truth-functional operator of logical conjunction, the and of a set of operands is true if and only if all of its operands are true. The logical connective that represents this operator is written as ∧ or ⋅. A and B is true only if A is true and B is true, an operand of a conjunction is a conjunct. Related concepts in other fields are, In natural language, the coordinating conjunction, in programming languages, the short-circuit and control structure. And is usually denoted by an operator, in mathematics and logic, ∧ or ×, in electronics, ⋅. In Jan Łukasiewiczs prefix notation for logic, the operator is K, logical conjunction is an operation on two logical values, typically the values of two propositions, that produces a value of true if and only if both of its operands are true. The conjunctive identity is 1, which is to say that AND-ing an expression with 1 will never change the value of the expression. In keeping with the concept of truth, when conjunction is defined as an operator or function of arbitrary arity. The truth table of A ∧ B, As a rule of inference, conjunction introduction is a classically valid, the argument form has two premises, A and B. Intuitively, it permits the inference of their conjunction, therefore, A and B. or in logical operator notation, A, B ⊢ A ∧ B Here is an example of an argument that fits the form conjunction introduction, Bob likes apples. Therefore, Bob likes apples and oranges, Conjunction elimination is another classically valid, simple argument form. Intuitively, it permits the inference from any conjunction of either element of that conjunction, therefore, A. or alternately, A and B. In logical operator notation, A ∧ B ⊢ A. falsehood-preserving, yes When all inputs are false, walsh spectrum, Nonlinearity,1 If using binary values for true and false, then logical conjunction works exactly like normal arithmetic multiplication. Many languages also provide short-circuit control structures corresponding to logical conjunction. Logical conjunction is used for bitwise operations, where 0 corresponds to false and 1 to true,0 AND0 =0,0 AND1 =0,1 AND0 =0,1 AND1 =1. The operation can also be applied to two binary words viewed as bitstrings of length, by taking the bitwise AND of each pair of bits at corresponding positions. For example,11000110 AND10100011 =10000010 and this can be used to select part of a bitstring using a bit mask. For example,10011101 AND00001000 =00001000 extracts the fifth bit of an 8-bit bitstring

3.
Chevron (insignia)
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A chevron is an inverted V-shaped pattern. The chevron occurs in early art including designs on pottery and rock carvings, examples can be found approximately 1800 BC in archaeological recovery of pottery designs from the palace of Knossos on Crete in the modern day country of Greece. Sparta used a capital lambda on their shields, a chevron is one of the ordinaries in heraldry, one of the simple geometrical figures which are the chief images in many coat of arms. It can be subject to a number of modifications, when the ends are cut off in a way that looks like the splintered ends of a broken piece of wood, with an irregular zig-zag pattern, it is called éclaté. When shown as a smaller size than standard, it is a called a chevronel. Chevrons appeared early in the history of heraldry, especially in Normandy, in Scandinavia the chevron is known as sparre, an early example appears in the arms of Armand desmondly. In areas observing Commonwealth of Nations or United States doctrine, chevrons are used as an insignia of enlisted or NCO rank by military forces, one chevron usually designates a lance corporal, two a corporal, and three a sergeant. One to four rockers may also be incorporated to indicate various grades of sergeant, in American usage, chevrons typically point towards the neck, in Commonwealth usage they usually point away from the neck. In the Commonwealth, the terminology for rank chevrons includes the number of stripes, called bars, therefore. Canadian and Australian Forces often refer to chevrons as hooks, in the Dutch armed forces they are nicknamed bananas. In some armies, small chevrons are worn on the left sleeve to indicate length of service. The Israel Defense Forces use chevrons in various orientations as organizational designators on their vehicles, specifically which company within a battalion they belong to