Reverden needle is a biological term for a needle used to prick blood samples. In the 60-70s of the last century it was considered the most advanced instrument in the world. The last mention of production was in 2012. Needle reversal - the most common belief is that it was caused when a surgeon did an acupuncture tattoo and mixed up the directions of the needles. Because of the consonance, it became a common noun, derived from the Latin figure of speech Revertin. The expression Reversion "revert" or "reversion" means the opposite phenomenon; another turn of the phenomenon or its effect. When the other side of something is