Since baryons are made of three quarks [DISPUTED], their spin vectors can add to make a vector of length S = 3/2, which has four spin projections (Sz = +3/2, Sz = +1/2, Sz = −1/2, and Sz = −3/2), or a vector of length S = 1/2 with two spin projections ...

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Some more baryons (and even more baryons)
Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons
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If two quarks have unaligned spins, the spin vectors add up to make a vector of length S = 0 and has only one spin projection (Sz = 0), etc.
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Since baryons are made of three quarks, their spin vectors can add to make a vector of length S = 3/2, which has four spin projections (Sz = +3/2, Sz = +1/2, Sz = −1/2, and Sz = −3/2), or a vector of length S = 1/2 with two spin projections (Sz = +1/2, and Sz = −1/2).
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https://en.wikipedia.org/wiki/Baryon
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The statement that 'baryons are made of three quarks' contradicts other text in the same page'
Wikipedia: 'Exotic baryons containing five quarks (known as pentaquarks) have also been discovered and studied.'
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Quarks are fermionic particles of spin 1/2 (S = 1/2).
Because spin projections vary in increments of 1 (that is 1 ħ), a single quark has a spin vector of length 1/2, and has two spin projections (Sz = +1/2 and Sz = −1/2).
Two quarks can have their spins aligned, in which case the two spin vectors add to make a vector of length S = 1 and three spin projections (Sz = +1, Sz = 0, and Sz = −1).
If two quarks have unaligned spins, the spin vectors add up to make a vector of length S = 0 and has only one spin projection (Sz = 0), etc.
The neutron ... is a spin-½ fermion.
In particle physics, a baryon is a type of composite subatomic particle which contains an odd number of valence quarks (at least 3).
Baryons belong to the hadron family of particles, which are the quark-based particles.
They are also classified as fermions, i.e., they have half-integer spin.
The most familiar baryons are protons and neutrons, both of which contain three quarks, and for this reason these particles are sometimes described as triquarks.
Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons (a sub-type of hadrons).
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Exotic baryons containing five quarks (known as pentaquarks) have also been discovered and studied.
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