Particle Physics: What is Nano Particle?

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mrinmoymahapa
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What is nano particle?
 
a nanoparticle refers to a particle around the order of (10 to the power of -9/10^-9) meters, or in the order of a nanometer.
 
By the way, when people talk about "particle physics" they usually mean elementary particles like electrons, protons, pions, muons, quarks, etc.