Stempel

noun
  1. A stamp or mark, especially one used to authenticate or certify documents. noun
    The official stempel on the document indicated it was approved by the authorities.
    He collected various stempels from different countries in his passport.
  2. A support or prop, often used in mining to describe a post or beam used to support the roof of a mine. noun
    The miners installed a stempel to prevent the tunnel from collapsing.
    They used wooden stempels to hold up the ceiling in the old mine shaft.