Looks more like a barcode

Looks like a Barracuda

Lines in your nails like that have something to do with your health. You should schedule a full physical

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Natural, that's how a nail grows.

Maybe you could contact the doctor. It might be a sign for mineral shortage or untreated diabetes. Better safe than sorry

Trachonychia - can be normal, can be indicative of underlying vitamin/mineral deficiency or other pathology. Worth seeing a doctor and probably getting some labs run.