Wikipedia
PocketQube
A PocketQube is a type of miniaturized satellite for space research that usually has a size of 5 cm cubed, has a mass of no more than 180 grams, and typically uses commercial off-the-shelf components for its electronics.
Beginning in 2009, Morehead State University (MSU) and Kentucky Space developed the PocketQube specifications to help universities worldwide to perform space science and exploration. While the bulk of development comes from academia, several companies build PocketQube, such as Stadako and PocketQube Shop. PocketQube projects have even been the subject of Kickstarter campaigns. The PocketQube format is also popular with amateur radio satellite builders.