DMM, or Digital Multimeter, is a commonly used tool in electronics and electrical engineering. It is used to measure various electrical quantities such as voltage, current, and resistance. Some synonyms that can be used for DMM are digital voltmeter, digital ammeter, and digital ohmmeter. These terms are often used interchangeably with DMM and have similar functionalities. A digital voltmeter measures the potential difference between two points, while a digital ammeter measures electric current. A digital ohmmeter measures the amount of resistance in an electrical circuit. These terms are helpful in understanding the specific functions of a DMM and its usage in electrical measurements.