Does anyone know what this step between the two lines mean? 
Electronic – What symbol is this
componentselectricalidentificationschematicssymbol [~]
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Best Answer
This could indicate a twisted pair. I have personally used a similar symbol for that and also some websites agree with this, such as this one
It also looks like SolidWorks Electrical has this symbol for this purpose too:
(the image is taken from this forum)
It doesn't seem to be standardized, so we see many variations.