It means it has five distinct spin states. The only particle I can think of off the top of my head with a spin of 2 is the (as yet not directly observed) graviton.
Electrons
Taking a 'particle' as a proton/ neutron, both of these have spin 1/2. So do all leptons (electrons, neutrinos, etc).
mass spin and charge
Spin.
Peter A. Carruthers has written: 'Spin and isospin in particle physics' -- subject(s): Isobaric spin, Nuclear spin
A beta particle is either an electron, or an anti-electron (positron). Both have a spin of 1/2.
In particle physics, fermions are particles with a half-integer spin, such as protons and electrons.
it is isospin - In physics, and specifically, particle physics, isospin (isotopic spin, isobaric spin) is a quantum number
Not to be confused with spin angular momentum, the spin of a charged particle is associated with a magnetic dipole moment. All fermions (elementary particles) have spin 1/2. And spin comes as n/2 where n is an integer greater than or equal to 0.
Fundamental particles such as the electron or the photon have an intrinsic spin, and this spin can't change - for example, an electron always has a spin of 1/2. I don't think the Pauli equation would change that.
Edumondus Albertus de Kerf has written: 'On the covariant description of spin' -- subject(s): Dynamics of a particle, Nuclear spin