U+223F Sine Wave
U+223F was added in Unicode version 1.1 in 1993. It belongs to the block
This character is a Math Symbol and is commonly used, that is, in no specific script. The character is also known as alternating current.
The glyph is not a composition. It has no designated width in East Asian texts. In bidirectional text it acts as Other Neutral. When changing direction it is mirrored. The word that U+223F forms with similar adjacent characters prevents a line break inside it.
The Wikipedia has the following information about this codepoint:
A sine wave, sinusoidal wave, or sinusoid (symbol: ∿) is a periodic wave whose waveform (shape) is the trigonometric sine function. In mechanics, as a linear motion over time, this is simple harmonic motion; as rotation, it corresponds to uniform circular motion. Sine waves occur often in physics, including wind waves, sound waves, and light waves, such as monochromatic radiation. In engineering, signal processing, and mathematics, Fourier analysis decomposes general functions into a sum of sine waves of various frequencies, relative phases, and magnitudes.
When any two sine waves of the same frequency (but arbitrary phase) are linearly combined, the result is another sine wave of the same frequency; this property is unique among periodic waves. Conversely, if some phase is chosen as a zero reference, a sine wave of arbitrary phase can be written as the linear combination of two sine waves with phases of zero and a quarter cycle, the sine and cosine components, respectively.
Representations
System  Representation 

Nº  8767 
UTF8  E2 88 BF 
UTF16  22 3F 
UTF32  00 00 22 3F 
URLQuoted  %E2%88%BF 
HTML hex reference  ∿ 
Wrong windows1252 Mojibake  âˆ¿ 
HTML named entity  ∿ 
alias  alternating current 
Elsewhere
Complete Record
Property  Value 

1.1 (1993)  
SINE WAVE  
—  
Mathematical Operators  
Math Symbol  
Common  
Other Neutral  
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