Script that consists of tangible characters and therefore needs to be felt (i.e. read) with the finger tips. It was invented in 1829 by Louis Braille. In order to teach the basics of braille, de so-called letter-board is used. On that board groups of 6 holes are drilled in which wooden sticks are placed in order to form letters. Then a wooden board with small holes is used to form the letters with small nails with flat heads, followed by a printed learning course. The disadvantage of braille is that the size of a book in braille is a lot greater than the same book in normal print. In order to compensate, many countries are using abbreviation systems.