四無常偈 (or 四非常偈)
Dictionary Definition :
Definition[1]
:
Eight stanzas in the 仁王經, two each on 無常 impermanence, 苦 suffering, 空 the void, and 無我 non-personality; the whole four sets embodying the impermanence of all things.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous