Codes designed to assist the human memory. The microprocessor language consists of binary words, which are a series of 0s and 1s, making it difficult for the programmer to remember the instructions corresponding to a given operation. To assist the human memory, the binary numbered codes are assigned groups of letters (of mnemonic symbols) that suggest the definition of the instruction. For example, the 8085 code 100000 binary means load accumulator and is represented by the mnemonic LDA.