Printed Circuit Board
This is the generic printed circuit board used in the Free Space Laser Communicator project and the Solderless Breadboard projects.
It has room for a 20 pin integrated circuit (10 rows of 5 holes, arranged as 3 holes for parts and 2 holes for external connections).
There are two boards connected by snap-off tabs, so either two separate projects, or one larger project can be made using the same board. Similar to the Radio Shack part number 276-159B.