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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