block diagram
diagram of a system in which the principal parts or functions are represented by blocks connected by lines that show the relationships of the blocks
en-US/ˈblɑk ˈdaɪəˌɡɹæm/
en-GB/ˈblɒk ˈdaɪəɡɹæm/
diagram of a system in which the principal parts or functions are represented by blocks connected by lines that show the relationships of the blocks