The usual symbol for an antimatter particle is a bar over the corresponding matter
particle symbol. For example, a proton
( )
has an antiparticle denoted by
 ,
pronounced p-bar. The antiparticle of a
proton is
called an
antiproton.
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For some
antiparticles the sign of its charge is shown instead of using
the bar. The antiparticle of the electron
(e-) has a special name,
positron
(e+).
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