Security Features In Coins

Russia has the feature on some of their 10 ruble coins. I don't have my coins in front of me to take a pic, but here's a Numista link as an example.
https://en.numista.com/catalogue/pieces192737.html

It isn't an actual "hologram". The technical term is a "latent image". It works by creating microscopic grooves and ridges with mirrored surfaces at different angles; these reflect light in different directions, making parts of the coin brighter or darker, depending on the angles of illumination and observation.

"Is it helpful"? People are usually aware that their coins have latent images on them, but their utility depends on whether or not people actually bother to try to look at them. On a bullion coin where the buyer normally has time to examine the coin closely, sure it's useful. Perhaps not so much on a circulation coin, where you're in a rush to buy or sell and can't be bothered looking too closely at the coins you receive. Plus, of course, for a circulation coin, the finely chiselled and carefully sculpted ridges of a latent image are easily damaged after just a brief time in actual hand-to-hand circulation; by the time a coin with a latent image is worn down to EF condition, the image is effectively gone. I have seen heavily worn Japanese (500 yen) and Taiwanese ($10) coins with latent images; the images are so badly damaged and hard to read, they might as well not be there.