U+3381 Square Na
U+3381 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 ampere (, US: ; symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI). One ampere is equal to 6.241509074×10^{18} electrons worth of charge moving past a point in a second. It is named after French mathematician and physicist AndréMarie Ampère (1775–1836), considered the father of electromagnetism along with Danish physicist Hans Christian Ørsted.
As of the 2019 redefinition of the SI base units, the ampere is defined by fixing the elementary charge e to be exactly 1.602176634×10^{−19} C (coulomb), which means an ampere is an electrical current equivalent to 10^{19} elementary charges moving every 1.602176634 seconds or 6.241509074×10^{18} elementary charges moving in a second. Prior to the redefinition the ampere was defined as the current that would need to be passed through 2 parallel wires 1 metre apart to produce a magnetic force of 2×10^{−7} newtons per metre.
The earlier CGS system had two definitions of current, one essentially the same as the SI's and the other using electric charge as the base unit, with the unit of charge defined by measuring the force between two charged metal plates. The ampere was then defined as one coulomb of charge per second. In SI, the unit of charge, the coulomb, is defined as the charge carried by one ampere during one second.
Representations
System  Representation 

Nº  13185 
UTF8  E3 8E 81 
UTF16  33 81 
UTF32  00 00 33 81 
URLQuoted  %E3%8E%81 
HTML hex reference  ㎁ 
Wrong windows1252 Mojibake  ãŽ 
Encoding: EUCKR (hex bytes)  A7 CA 
Adobe Glyph List  nasquare 
Elsewhere
Complete Record
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1.1 (1993)  
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