Terminology involved in digital multimeter

Accuracy
Indicates the difference between the DMM's measured value and the actual value. Expressed as a percentage of reading or as a percentage of full scale.
Analog meter:
An instrument that uses an analog pointer to display measured values. The user judges the reading by the position of the pointer in the stroke.
Annunciator:
Used to indicate that the selected range or function is incorrect.
Average Responding DMM:
Sine waves can be measured accurately, but not enough when measuring non-sine waves.
Word (Count):
The last digit of the digital multimeter is often used together with the percentage to indicate the accuracy of the digital multimeter.
Current-shunt:
The DMM has a low value resistor for measuring current. The digital multimeter measures the voltage across it and uses Ohm's law to calculate the current value.
Digital Multimeter (DMM): Displays the value of the measured signal in digital form. The characteristic of the digital watch is that the accuracy, resolution, reliability and other indicators are higher than that of the analog watch.
Non-sinusoidal waveform:
Waveforms such as pulse train, square, triangle, sawtooth, peak, etc.
Resolution:
The smallest change that can be observed in the measurement.
Effective value (RMS):
A measure of an AC signal that is equivalent to a DC signal.
Standard sine wave (Sinusoidal waveform):
A signal that varies sinusoidally without distortion.
True RMS Digital Multimeter (True-rms):
Digital multimeter that can accurately measure the rms value of sine and non-sine waves.