where a is the unit cell edge length of the crystal, ||b|| is the magnitude of Burgers vector and h, k, and l are the components of the Burgers vector, b = ( a / 2 ) ⟨ h k l ⟩ {\displaystyle (a/2)\langle hkl\rangle } , and the coefficient a/2 is owing to the fact that in BCC and FCC lattices, the shortest lattice vectors could be as expressed ( a / 2 ) ⟨ h k l ⟩ {\displaystyle (a/2)\langle hkl\rangle } . Comparatively, for simple cubic lattices, b = a ⟨ h k l ⟩ {\displaystyle a\langle hkl\rangle } and hence the magnitude is represented by