Negative. The dashed line below indicates the ground reference, and the solid line over it represents the voltage potential as being steady-state(direct current).
__________________________ +N volts
------------------------------ Grd
This is also as it would appear on a Oscilloscope where the dashed line is the reticule embossed on the face of the scope, and the solid line is the trace when a DC voltage is applied to the tip of the probe.
As for the reason this is done, it's an intl mime thing, where the iconic representation does not rely on the acronymic letters found in English.
Example: Alternating Current - AC in English is Courant Alternatif in French, which would abbreviate to: CA. and 'Voltage' would translate to 'Tension', so 'AC Voltage' in English is 'Tension CA', and so on and so forth for other languages. The "~" symbology is more international in understanding.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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