Vendors use different characters to symbolize the program counter in assembly language programs. While the usage of a "$" character is prevalent in Intel, Zilog, Texas Instruments, Toshiba, NEC, Siemens and AMD processor documentation, Motorola, Rockwell Semiconductor, Microchip Technology and Hitachi instead use a "*" character,[9] whereas SGS-Thomson Microelectronics uses "PC".[9]