  We take a pragmatic definition of reconnection to find locations where a
reconnection electric field causes a ExB drift that carries two components of
the magnetic field towards their elimination. With this in mind as our target,
we observe that such locations can be found using a new indicator: the velocity
of the Lorentz transformation that eliminates two components of the local
magnetic field. Serendipitously, the indicator naturally becomes subluminal in
the close proximity of a point where two components of the magnetic field
vanish and it is hard zero at the vanishing location. Everywhere else the
velocity of this Lorentz frame change far exceeds the speed of light. This
property can be quickly applied in practice because computing the frame change
is a local operation that requires only the knowledge of the local magnetic and
electric field: it can be applied in a simulation or in observational data from
a field instrument. We further show that the points identified can be
classified in 6 categories that extend the usual types of magnetic nulls to the
case of 3D reconnection in presence of a guide field. The approach is used to
identify secondary electron scale reconnection sites in a turbulent outflow
from a primary reconnection site in a highly resolved massively parallel fully
kinetic particle in cell simulation. Numerous points are found and their
detailed analysis is reported.
