wiring - What do solid/striped lines on a wire indicate

What do solid or dashed lines on a wire indicate? Is there a difference between the solid and dashed indicators?

Which wire is negative on this PC fan? - Electrical Engineering Stack Exchange

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Wiring Color Codes - NEC Electrical Standards & 3-Phase

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Stripes on one side of an electrical cord. Smooth on the other. Which is positive? - Quora

How to Identify Positive & Negative Wires: AC, DC, & More

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Wire Color Code: Explanation of Each Wire Color

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wiring - What do solid/striped lines on a wire indicate? - Electrical Engineering Stack Exchange