1996 P Roosevelt Dime Reverse Error

They are die gouges, probably caused by a tool of some sort. It is often impossible to round down EXACTLY what caused stuff you see on the coins. Categorically, though, these are die gouges - nothing special.

Please do take note and be aware that there tends to be a vast over-use of the term 'error', to the extent that it has become to mean basically anything on any coin that's not 'perfect' as intended. There are a large number of very minor anomalies that can occur during the minting process that are easily accepted as just another part of the minting process and let go by the mint because the alternative would be too costly to bother.

Things like die gouges, die cracks, minor die chips, Machine Doubling, Die Deterioration issues, overpolishing, and minor clash marks are ALL simple anomalous things that are accepted as a normal part of minting coins. Your coin falls in this category, and thus would not be classified as an error by most veteran collectors.

Sorry thought this was my post disregard that last piaster thanks!