Symbols:J
Imaginary Unit
- $j$
Used in physics and engineering to denote the imaginary unit.
This is to relieve confusion with electric current, often denoted with the letter $i$.
The $\LaTeX$ code for \(j\) is j .
Unit $y$ Vector
- $\mathbf j$
Used to denote the unit vector in the positive direction of the $y$-axis.
The $\LaTeX$ code for \(\mathbf j\) is \mathbf j .
Unit Quaternion
- $\mathbf j$
Used to denote one of the units in the system of quaternions.
The $\LaTeX$ code for \(\mathbf j\) is \mathbf j .
Bessel Function of the First Kind
- $\map {J_n} x$
The Bessel function of the first kind of order $n$ is denoted $\map {J_n} x$.
The $\LaTeX$ code for \(\map {J_n} x\) is \map {J_n} x .
Electric Current
- $\mathbf J$
The usual symbol used to denote an electric current when it is necessary to treat it as a vector quantity is $\mathbf J$.
Its $\LaTeX$ code is \mathrm J .
Joule
- $\mathrm J$
The symbol for the joule is $\mathrm J$.
Its $\LaTeX$ code is \mathrm J .
Joule per Metre-Second-Kelvin
- $\mathrm {J / m \cdot s \cdot K}$
The symbol for the joule per metre-second-kelvin is $\mathrm {J / m \cdot s \cdot K}$.
Its $\LaTeX$ code is \mathrm {J / m \cdot s \cdot K} .