Dials are a type of device used for various purposes. The term 'dials' can refer to the five-letter word 'calls', which are used to communicate with people over the phone or other communication devices. It can also refer to the six-letter word 'gauges', which are used to measure and monitor various physical properties such as pressure, temperature, and speed. Finally, it can refer to the six-letter word 'PHONES', which are used to make and receive calls. All of these devices use dials to control their functions.