U+33D1 Square Ln
U+33D1 was added to Unicode in version 1.1 (1993). It belongs to the block
This character is a Other Symbol and is commonly used, that is, in no specific script.
The glyph is a Square composition of the glyphs
The Wikipedia has the following information about this codepoint:
The natural logarithm of a number is its logarithm to the base of the mathematical constant e, which is an irrational and transcendental number approximately equal to 2.718281828459. The natural logarithm of x is generally written as ln x, log_{e} x, or sometimes, if the base e is implicit, simply log x. Parentheses are sometimes added for clarity, giving ln(x), log_{e}(x), or log(x). This is done particularly when the argument to the logarithm is not a single symbol, so as to prevent ambiguity.
The natural logarithm of x is the power to which e would have to be raised to equal x. For example, ln 7.5 is 2.0149..., because e^{2.0149...} = 7.5. The natural logarithm of e itself, ln e, is 1, because e^{1} = e, while the natural logarithm of 1 is 0, since e^{0} = 1.
The natural logarithm can be defined for any positive real number a as the area under the curve y = 1/x from 1 to a (with the area being negative when 0 < a < 1). The simplicity of this definition, which is matched in many other formulas involving the natural logarithm, leads to the term "natural". The definition of the natural logarithm can then be extended to give logarithm values for negative numbers and for all nonzero complex numbers, although this leads to a multivalued function: see Complex logarithm for more.
The natural logarithm function, if considered as a realvalued function of a real variable, is the inverse function of the exponential function, leading to the identities:
 e ln x = x if x is strictly positive , ln e x = x if x is any real number . {displaystyle {egin{aligned}e^{ln x}&=xqquad { ext{ if }}x{ ext{ is strictly positive }},\ln e^{x}&=xqquad { ext{ if }}x{ ext{ is any real number .}}end{aligned}}}
Like all logarithms, the natural logarithm maps multiplication of positive numbers into addition:
 ln ( x ⋅ y ) = ln x + ln y . {displaystyle ln(xcdot y)=ln x+ln y~.}
Logarithms can be defined for any positive base other than 1, not only e. However, logarithms in other bases differ only by a constant multiplier from the natural logarithm, and can be defined in terms of the latter. For instance, the base2 logarithm (also called the binary logarithm) is equal to the natural logarithm divided by ln(2), the natural logarithm of 2, or equivalently, multiplied by log_{2}(e).
Logarithms are useful for solving equations in which the unknown appears as the exponent of some other quantity. For example, logarithms are used to solve for the halflife, decay constant, or unknown time in exponential decay problems. They are important in many branches of mathematics and scientific disciplines, and are used to solve problems involving compound interest.
Representations
System  Representation 

Nº  13265 
UTF8  E3 8F 91 
UTF16  33 D1 
UTF32  00 00 33 D1 
URLQuoted  %E3%8F%91 
HTML hex reference  ㏑ 
Wrong windows1252 Mojibake  ã‘ 
Adobe Glyph List  squareln 
Elsewhere
Complete Record
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1.1 (1993)  
SQUARE LN  
SQUARED LN  
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