pendulum

باللغة العربية: نُوَاس، رَقَّاص، بَنْدُول

1. A body suspended from a fixed support so that it swings freely back and forth under the influence of gravity, commonly used to regulate various devices such as clocks.
2. The tendency of a situation to oscillate (between two extremes).
3. A lamp, etc. suspended from a ceiling.
4. A watch's guard-ring by which it is attached to a chain.

الجمع pendulums