Computer register are designated by capital letters to denote the function of the register.for example ,the register that holds an address for the memory unit is ususlly called a memory address regster and is designated by the MAR.other designations for register are PC ,IR and R1 . The indivdual flip flops in an n-bit register are numbered in sequence from 0 through n-1,starting from 0 in the rightmost position and increasing the numbers toward the left.The most common way to repreent a register is  by a rectangular box with the name of the register inside.Information transfer from one register to another is designated in symbolic form by means of a replacement operator.