This is an abbreviation for an Integrated Circuit.
An Integrated Circuit is a circuit, or many circuit blocks reduced down and miniturised to fit on a small package. These are more commonly referred to as "Chips". some of these may contain many thousands, or millions of Transistors and other components in one package. It is this which has allowed such vast miniturisation of circuits to take place in the last decade or so.
Time to build your own robot! Using a Raspberry Pi with parts and some time, you can use my book to learn how to make and program a robot with automatic behaviours.