Linked from
The 9 pages that link to Bohr magneton, each with the reason it gives.
Magnetic momentRelated: It provides a standard unit for comparing electron-scale moments.
MagnetizationRelated: Electron magnetic moments are often compared in units of the Bohr magneton.
Reduced Planck constantRelated: Its value combines ℏ with the electron’s charge and mass.
Pauli paramagnetismRelated: It sets the magnetic energy scale of the spin splitting.