Simple solution to save your seed without having to "type" letters. The letters of the alphabet are marked in the grid and you can mark the first 4 letters of your seed word with an automatic punch (4 letters are always enough to save the whole word, they are subsequently automatically added in the HW wallet), i.e. 12 words on one side and the other make a total of 24 words to restore your seed on a Trezor or Ledger HW wallet.