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Lambda (/ˈlæmbdə/;^{[1]} uppercase Λ, lowercase λ; Greek: λάμ(β)δα, lám(b)da) is the 11th letter of the Greek alphabet, representing the sound /l/. In the system of Greek numerals, lambda has a value of 30. Lambda is derived from the Phoenician Lamed . Lambda gave rise to the Latin L and the Cyrillic El (Л). The ancient grammarians and dramatists give evidence to the pronunciation as [laːbdaː] (λάβδα) in Classical Greek times.^{[2]} In Modern Greek, the name of the letter, Λάμδα, is pronounced [ˈlam.ða].
In early Greek alphabets, the shape and orientation of lambda varied.^{[3]} Most variants consisted of two straight strokes, one longer than the other, connected at their ends. The angle might be in the upperleft, lowerleft ("Western" alphabets) or top ("Eastern" alphabets). 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 Romans put the angle at the lowerleft.
The HTML 4 character entity references for the Greek capital and small letter lambda are Λ
and λ
respectively.^{[4]} The Unicode code points for lambda are U+039B and U+03BB.
The most common way expressed is 10^29 g/cm3 which are the units used when calculating omega lambda(λ).
Examples of the symbolic use of uppercase lambda include:
Examples of the symbolic use of lowercase lambda include:
The Roman libra and Byzantine lítra (λίτρα), which served as both the pound mass unit and liter volume unit, were abbreviated in Greek using lambda with modified forms of the iota subscript (as λͅ). These are variously encoded in Unicode. The Ancient Greek Numbers Unicode block includes 10183 GREEK LITRA SIGN (𐆃) as well as 𐅢, which is described as 10162 GREEK ACROPHONIC HERMIONIAN TEN^{[15]} but was much more common as a form of the litra sign. A variant of the sign can be formed from 0338 COMBINING LONG SOLIDUS OVERLAY and either 039B GREEK CAPITAL LETTER LAMDA (Λ̸) or 03BB GREEK SMALL LETTER LAMDA (λ̸).^{[16]}
Unicode uses the spelling "lamda" in character names, instead of "lambda", due to "preferences expressed by the Greek National Body".^{[17]}
Preview  Λ  λ  ᴧ  Ⲗ  ⲗ  

Unicode name  GREEK CAPITAL LETTER LAMDA  GREEK SMALL LETTER LAMDA  GREEK LETTER SMALL CAPITAL LAMDA  COPTIC CAPITAL LETTER LAULA  COPTIC SMALL LETTER LAULA  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  923  U+039B  955  U+03BB  7463  U+1D27  11414  U+2C96  11415  U+2C97 
UTF8  206 155  CE 9B  206 187  CE BB  225 180 167  E1 B4 A7  226 178 150  E2 B2 96  226 178 151  E2 B2 97 
Numeric character reference  Λ 
Λ 
λ 
λ 
ᴧ 
ᴧ 
Ⲗ 
Ⲗ 
ⲗ 
ⲗ 
Named character reference  Λ  λ  
DOS Greek  138  8A  162  A2  
DOS Greek2  182  B6  229  E5  
Windows1253  203  CB  235  EB  
TeX  \Lambda  \lambda 
Preview  𝚲  𝛌  𝛬  𝜆  𝜦  𝝀  

Unicode name  MATHEMATICAL BOLD CAPITAL LAMDA 
MATHEMATICAL BOLD SMALL LAMDA 
MATHEMATICAL ITALIC CAPITAL LAMDA 
MATHEMATICAL ITALIC SMALL LAMDA 
MATHEMATICAL BOLD ITALIC CAPITAL LAMDA 
MATHEMATICAL BOLD ITALIC SMALL LAMDA  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  120498  U+1D6B2  120524  U+1D6CC  120556  U+1D6EC  120582  U+1D706  120614  U+1D726  120640  U+1D740 
UTF8  240 157 154 178  F0 9D 9A B2  240 157 155 140  F0 9D 9B 8C  240 157 155 172  F0 9D 9B AC  240 157 156 134  F0 9D 9C 86  240 157 156 166  F0 9D 9C A6  240 157 157 128  F0 9D 9D 80 
UTF16  55349 57010  D835 DEB2  55349 57036  D835 DECC  55349 57068  D835 DEEC  55349 57094  D835 DF06  55349 57126  D835 DF26  55349 57152  D835 DF40 
Numeric character reference  𝚲 
𝚲 
𝛌 
𝛌 
𝛬 
𝛬 
𝜆 
𝜆 
𝜦 
𝜦 
𝝀 
𝝀 
Preview  𝝠  𝝺  𝞚  𝞴  

Unicode name  MATHEMATICAL SANSSERIF BOLD CAPITAL LAMDA 
MATHEMATICAL SANSSERIF BOLD SMALL LAMDA 
MATHEMATICAL SANSSERIF BOLD ITALIC CAPITAL LAMDA 
MATHEMATICAL SANSSERIF BOLD ITALIC SMALL LAMDA  
Encodings  decimal  hex  decimal  hex  decimal  hex  decimal  hex 
Unicode  120672  U+1D760  120698  U+1D77A  120730  U+1D79A  120756  U+1D7B4 
UTF8  240 157 157 160  F0 9D 9D A0  240 157 157 186  F0 9D 9D BA  240 157 158 154  F0 9D 9E 9A  240 157 158 180  F0 9D 9E B4 
UTF16  55349 57184  D835 DF60  55349 57210  D835 DF7A  55349 57242  D835 DF9A  55349 57268  D835 DFB4 
Numeric character reference  𝝠 
𝝠 
𝝺 
𝝺 
𝞚 
𝞚 
𝞴 
𝞴 
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.
Look up Λ or λ in Wiktionary, the free dictionary. 