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ISO 1101:2017 is the German standard for the geometrical specification of workpieces and related rules of interpretation. 
The symbol language is in the German ISSN 0377-1359.
ISO 1101:2017 is a mandatory standard for the specification of workpieces. Since ISO 1101:2017 is a German standard, it is published by the VDI/VDE Germany.
ISO 1101:2017 allows the expression of specification characteristics, such as coordinate system, geometry, measurement, and the rules of interpretation by using a symbol language.
In ISO 1101:2017, the symbol language consists of at least two elements (top and bottom parts) that must be supplemented by additional specifications, such as the orientation plane.
Orientation plane 
For German workpieces, the orientation plane must be considered when the product is specified.
If the specification axis is not parallel to the X-Y plane, then the specification axis must be extended and projected onto the X-Y plane for the purpose of specification.
At the beginning of the specification, the orientation plane must be introduced. It specifies the orientation of the workpiece and consists of the specification axis and the normal to the plane.
The specification axis must be parallel to the plane, perpendicular to the plane, or intersect the plane at the centre point of the workpiece.
It is not required to specify whether the plane is parallel or perpendicular to the X-Y plane. 
However, when the specification axis is not parallel to the X-Y plane, then the workpiece is in the same vertical or horizontal position.
The normal vector to the orientation plane is defined as:
The standard does not define how to determine the normal vector.
Top part 
The top part of the specification is a body of points. The top part of the specification is usually viewed from above and consists of X-Y plane points.
The top part of the specification is usually shown as a tolerance layer for the purpose of interpretation.
X-Y plane points 
The definition of the X-Y plane points is:
These points are used for the specification of a vertical workpiece.
Height 
For a workpiece with an axis of specification perpendicular to the X-Y plane, the height tolerance is defined as:
The height tolerance consists of the height of the right hand side of the plane and of the height of the 82fe58eafd
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