Buddha, Dharma and Sangha together are called the Three Jewels.
Tips
culture
Phonetic loan from Sanskrit saṃgha. Originally a community of four or more ordained monastics; later applied to monks individually. Shortened to just 僧 in everyday Chinese.
history
Together with 佛 (Buddha) and 法 (Dharma, doctrine), the 僧伽 forms the 三宝 (Three Jewels) - the three refuges every Buddhist takes.