The Biot-Savart Law describes the magnetic field generated by a steady current. It mathematically relates the magnetic field at a point to the current element and its position vector.
Ampère's Law: Relates magnetic field in a loop to electric current passing through that loop, expressed as $$\oint \mathbf{B} \cdot d\mathbf{l} = \mu_0 I_{enc}$$.
Magnetic Permeability: A measure of how much a material can support the formation of a magnetic field within itself, denoted by $\mu$. The permeability of free space is $\mu_0$.
Right-Hand Rule: A mnemonic for understanding direction conventions in electromagnetism; for example, it helps determine direction of magnetic force or field vectors.