Question: What is included in composite particles?
About the article "Subatomic particle", section "By composition".

Candidate passages:
In the physical sciences, subatomic particles are particles smaller than atoms.
(although some subatomic particles have mass greater than some atoms).
There are two types of subatomic particles: elementary particles, which according to current theories are not made of other particles; and "composite" particles.
Particle physics and nuclear physics study these particles and how they interact.
In particle physics, the concept of a particle is one of several concepts inherited from classical physics.
But it also reflects the modern understanding that at the quantum scale matter and energy behave very differently from what much of everyday experience would lead us to expect.
The idea of a particle underwent serious rethinking in light of experiments that showed that light could behave like a stream of particles (called photons) as well as exhibit wave-like properties.
This led to the new concept of wave–particle duality to reflect that quantum-scale "particles" behave like both particles and waves.
Another new concept, the uncertainty principle, states that such their properties as position and momentum cannot be measured exactly.
In more recent times, wave–particle duality has been shown to apply not only to photons but to increasingly massive particles.
Interactions of particles in the framework of quantum field theory are understood as creation and annihilation of "quanta" of corresponding fundamental interactions.
This blends particle physics with field theory. 
Particles can also be classified according to composition.
"Composite particles" refer to particles that have composition – that is particles which are made of other particles.
For example, a carbon-14 atom is made of six protons, eight neutrons, and six electrons.
By contrast, "elementary particles" (also called "fundamental particles") refer to particles that are not made of other particles.
According to our current understanding of the world, only a very small number of these exist, such as the leptons, quarks or gluons.
However it is possible that some of these might turn up to be composite particles after all, and merely appear to be elementary for the moment.
While composite particles can very often be considered "point-like", elementary particles are truly "punctual". 
Metal matrix composite plating can be manufactured when a substrate is plated in a bath containing a suspension of ceramic particles.
Careful selection of the size and composition of the particles can fine-tune the deposit for wear resistance, high temperature performance, or mechanical strength.
Tungsten carbide, silicon carbide, chromium carbide, and aluminum oxide (alumina) are commonly used in composite electroplating. 
  Composite particle, a particle which is made up of smaller particles  "Compositae" or "composite family" of flowering plants  Composite volcano, a layered conical volcano  Composite number, a positive integer that has at least one factor other than one or itself.  
In theoretical physics, the Weinberg–Witten theorem (WW), proved by Steven Weinberg and Edward Witten, states that massless particles (either composite or elementary) with spin "j" > 1/2 cannot carry a Lorentz-covariant current, while massless particles with spin "j" > 1 cannot carry a Lorentz-covariant stress-energy.
The theorem is usually interpreted to mean that the graviton ("j" = 2) cannot be a composite particle in a relativistic quantum field theory.