Using a Null Sign to Mean Negative in Medical Records

When I draw or make diagram for the results of my physical examination findings in a medical record, I use the null sign to mean negative.

null sign_2014

Before I use these two symbols: (+) to mean positive and (-) to mean negative.  I now use the null sign instead of (-) , one because of the ease of tampering of the (-)  into (+) just by adding a vertical line into the horizontal line, and two, to promote emphasis and clarity during my explanation to the patient and relatives when it comes to negative findings.

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