The 0x that you see in the code in many languages simply means "interpret the rest as a hexadecimal number". So the digits are in the range 0-9, A-F. There ar

The 0x that you see in the code in many languages simply means "interpret the rest as a hexadecimal number". So the digits are in the range 0-9, A-F. There are times you need a random constant that just has to be memorable. They used CAFEBABE. Apparently someone thought it would offend someone. So they switched to the popular DEADBEEF instead.