Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
In the case of pulse-width modulation (PWM), a technology for controlling many things like LED lights, each of these boxes represents an On state.
Source: https://www.slashgear.com/1332966/analog-vs-digital-signals-explained/