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aslijn

An aslijn is a term used in Dutch to denote a straight line that serves as an axis in various disciplines. It identifies the line around which an object rotates, or along which a figure is organized by symmetry. The concept is common in geometry, physics, and engineering, and is closely related to the English terms axis line or centerline.

In geometry and kinematics, the aslijn can be the axis of a coordinate system (for example the

The term reflects its Dutch roots from as (axis) and lijn (line), and is often used interchangeably

horizontal
x-axis
or
vertical
y-axis)
or
the
axis
of
a
figure
of
revolution,
where
the
object's
cross
sections
revolve
around
the
line.
In
engineering
drawings,
the
aslijn
marks
the
centerline
of
shafts,
holes,
or
other
features
and
is
used
for
alignment,
measurement,
and
assembly.
It
also
denotes
the
idealized
axis
about
which
parts
rotate
or
with
respect
to
which
tolerances
are
defined.
with
centerline
in
technical
contexts.
Related
concepts
include
the
axis
of
symmetry
and
the
rotational
axis
in
physics,
as
well
as
coordinate
axes
in
mathematics.
See
also
axis,
axis
of
symmetry,
centerline,
coordinate
axis,
and
line
of
centers.