A synchroscope is a device used to determine the synchronization of two alternating current sources. There are several synonyms for the word, including synchronoscope, syncro-scope, synchro-indicator, and synchronization indicator. Each of these terms refers to the same instrument used to monitor the phase relation between two or more AC power sources. Additionally, other terms related to synchroscope include "load-sharing system" and "synchronization panel." Synchroscopes are crucial in energy systems, where they play an essential role in maintaining the electrical grid's stability. Synchroscope has been used extensively in power plants and sub-stations that use multiple generators.