I'm writing an academic paper describing the calibration of a system. Part of that system is an absolute rotary encoder measuring the angle of a joint. However, the position at which the encoder gives a reading of '0' does not correspond to an angle of zero degrees (see edit). Rather than fussing with how the encoder is mounted, I simply found the value that the encoder returns when the joint is at zero degrees and subtract that value off of future measurements.
Is there a well-established* term to describe this point/value succinctly and, if so, what is it?
I have to imagine that this is an extremely common task in robotic manipulators and I'm having a hard time describing the process without a name for the point/value/position that I'm calibrating for. Zero point? Home position? Origin? Encoder offset?
*By well established, I simply mean something that someone familiar with the field of robotics will understand to mean what I'm trying to describe. My primary field is medical imaging/image guidance so I have no idea what terminology is or is not commonly understood.
Edit: 'zero degrees' meaning 'zero degrees with respect to the arm'. A reading of 0 indicates, by definition, zero degrees with respect to an arbitrary position on the encoder.