This easy to use highly effective acupressure device is popular in many countries and is variously named. You can find that Acupressure mat in different sources can be called Tibetan or Kuznetsov Applicator, Russian Prickle Pad, Bed of nails or even Hedgehog.
In Scandinavian countries it is also widely known as Spike mat or Spikmatta, Piikkimatto or even Shaktimatto or Shakti Mat.