Beta

"β" redirects here. For the German eszett, see ß. For other uses, see Beta (disambiguation).

Beta (UK: /ˈbiːtə/ or US: /ˈbeɪtə/; uppercase Β, lowercase β, or cursive ϐ; Template:Lang-grc or Template:Lang-ell víta) is the second letter of the Greek alphabet. In Ancient Greek, beta represented the voiced bilabial plosive /b/. In Modern Greek, it represents the voiced labiodental fricative /v/. Letters that arose from beta include the Roman letter ⟨B⟩ and the Cyrillic letters ⟨Б⟩ and ⟨В⟩.

Name

Like the names of most other Greek letters, the name of beta was adopted from the acrophonic name of the corresponding letter in Phoenician, which was the common Semitic word *bayt ('house'). In Greek, the name was βῆτα bêta, pronounced [bɛ̂ːta] in Ancient Greek. It is spelled βήτα in modern monotonic orthography, and pronounced [ˈvita]. In US English, the name is pronounced /ˈbeɪtə/, while in British English it is pronounced /ˈbiːtə/.

History

See also: Archaic Greek alphabets

The letter beta was derived from the Phoenician letter beth .

The letter Β had the largest number of highly divergent local forms. Besides the standard form (either rounded or pointed, ), there were forms as varied as (Gortyn), and (Thera), (Argos), (Melos), (Corinth), (Megara, Byzantium), (Cyclades).

Uses

The Greek alphabet on an ancient black figure vessel, with the characteristically angular beta of the time

Numeral

In the system of Greek numerals, beta has a value of 2. Such use is denoted by a number mark: Β′. In Scientific unit notation it is used as a particle and pronounced as a /bIta/

Computing

In computing, the term "beta" is used as (usually) the last testing release (or the preview release) in the software release life cycle before the "release" version. Beta versions often have a version number of the form "0.n", (or "build number"). Typically it is the last version before a version of a software is fully released to all its actual customers.

Finance

Beta is used in finance as a measure of investment portfolio risk. Beta in this context is calculated as the covariance of the portfolio's returns with its benchmark's returns, divided by the variance of the benchmark's returns. A beta of 1.5 means that for every 1% change in the value of the benchmark, the portfolio's value changes by 1.5%.

International Phonetic Alphabet

In the International Phonetic Alphabet, Greek minuscule beta denotes a voiced bilabial fricative [β].

Meteorology

The name Beta was used as a name during the 2005 Atlantic hurricane season as Hurricane Beta.

Mathematics and science

Beta is often used to denote a variable in mathematics and physics, where it often has specific meanings for certain applications, such as representing beta radiation. In regression analysis, ⟨B⟩ symbolizes nonstandardized partial slope coefficients, whereas ⟨β⟩ represents standardized (standard deviation-score form) coefficients; in both cases, the coefficients reflect the change in the criterion Y per one-unit change in the value of the associated predictor X.

β is sometimes used as a placeholder for an ordinal number if α is already used.

In spaceflight, Beta angle describes the angle between the orbit plane of a spacecraft or other body and the vector from the sun.

Rock climbing terminology

The term "beta" refers to advice on how to successfully complete a particular climbing route, boulder problem, or crux sequence.

Statistics

In statistics, beta may represent type II error, or regression slope.

Typography

In some high-quality typesetting, especially in the French tradition, a typographic variant of the lowercase letter without a descender is used within a word for ancient Greek: βίβλος is printed βίϐλος.

In typesetting technical literature, it is a commonly made mistake to use the German letter ß (a s–z or s–s ligature) as a replacement for β. The two letters resemble each other in some fonts, but they are unrelated.

Videotape format

Beta was the name of a domestic videotape format developed by Japan's Sony Corporation in the 1970s and 1980s. It competed with the Video Home System (VHS) format developed by the Japanese Victor Company, to which it eventually succumbed. The Beta format was also marketed as Betamax (Sony) and Betacord (Sanyo).

Character encodings

• Greek Beta

Character information

Preview	Β		β		ϐ		ᵝ		ᵦ
Unicode name	GREEK CAPITAL LETTER BETA		GREEK SMALL LETTER BETA		GREEK BETA SYMBOL		MODIFIER LETTER SMALL BETA		GREEK SUBSCRIPT SMALL LETTER BETA
Encodings	decimal	hex	dec	hex	dec	hex	dec	hex	dec	hex
Unicode	914	U+0392	946	U+03B2	976	U+03D0	7517	U+1D5D	7526	U+1D66
UTF-8	206 146	CE 92	206 178	CE B2	207 144	CF 90	225 181 157	E1 B5 9D	225 181 166	E1 B5 A6
Numeric character reference	Β	Β	β	β	ϐ	ϐ	ᵝ	ᵝ	ᵦ	ᵦ
Named character reference	Β		β
DOS Greek	129	81	153	99
DOS Greek-2	165	A5	215	D7
Windows 1253	194	C2	226	E2
TeX			\beta

• Latin Beta

Character information

Preview	Ꞵ		ꞵ
Unicode name	LATIN CAPITAL LETTER BETA		LATIN SMALL LETTER BETA
Encodings	decimal	hex	dec	hex
Unicode	42932	U+A7B4	42933	U+A7B5
UTF-8	234 158 180	EA 9E B4	234 158 181	EA 9E B5
Numeric character reference	Ꞵ	Ꞵ	ꞵ	ꞵ

• CJK Square Beta

Character information

Preview	㌼
Unicode name	SQUARE BEETA
Encodings	decimal	hex
Unicode	13116	U+333C
UTF-8	227 140 188	E3 8C BC
Numeric character reference	㌼	㌼

• Mathematical Beta

Character information

Preview	𝚩		𝛃		𝛣		𝛽		𝜝		𝜷
Unicode name	MATHEMATICAL BOLD CAPITAL BETA		MATHEMATICAL BOLD SMALL BETA		MATHEMATICAL ITALIC CAPITAL BETA		MATHEMATICAL ITALIC SMALL BETA		MATHEMATICAL BOLD ITALIC CAPITAL BETA		MATHEMATICAL BOLD ITALIC SMALL BETA
Encodings	decimal	hex	dec	hex	dec	hex	dec	hex	dec	hex	dec	hex
Unicode	120489	U+1D6A9	120515	U+1D6C3	120547	U+1D6E3	120573	U+1D6FD	120605	U+1D71D	120631	U+1D737
UTF-8	240 157 154 169	F0 9D 9A A9	240 157 155 131	F0 9D 9B 83	240 157 155 163	F0 9D 9B A3	240 157 155 189	F0 9D 9B BD	240 157 156 157	F0 9D 9C 9D	240 157 156 183	F0 9D 9C B7
UTF-16	55349 57001	D835 DEA9	55349 57027	D835 DEC3	55349 57059	D835 DEE3	55349 57085	D835 DEFD	55349 57117	D835 DF1D	55349 57143	D835 DF37
Numeric character reference	𝚩	𝚩	𝛃	𝛃	𝛣	𝛣	𝛽	𝛽	𝜝	𝜝	𝜷	𝜷

Character information

Preview	𝝗		𝝱		𝞑		𝞫
Unicode name	MATHEMATICAL SANS-SERIF BOLD CAPITAL BETA		MATHEMATICAL SANS-SERIF BOLD SMALL BETA		MATHEMATICAL SANS-SERIF BOLD ITALIC CAPITAL BETA		MATHEMATICAL SANS-SERIF BOLD ITALIC SMALL BETA
Encodings	decimal	hex	dec	hex	dec	hex	dec	hex
Unicode	120663	U+1D757	120689	U+1D771	120721	U+1D791	120747	U+1D7AB
UTF-8	240 157 157 151	F0 9D 9D 97	240 157 157 177	F0 9D 9D B1	240 157 158 145	F0 9D 9E 91	240 157 158 171	F0 9D 9E AB
UTF-16	55349 57175	D835 DF57	55349 57201	D835 DF71	55349 57233	D835 DF91	55349 57259	D835 DFAB
Numeric character reference	𝝗	𝝗	𝝱	𝝱	𝞑	𝞑	𝞫	𝞫

These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.