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無常の風 is an old Japanese proverb that means the wind of impermanence or the wind of change in Japanese.
This can refer to the force that ends life, like the wind scattering a flower's petals. Life is yet another impermanent existence that is fragile, blown out like a candle.
The first two characters mean uncertainty, transiency, impermanence, mutability, variable, and/or changeable.
In some Buddhist contexts, 無常 can be analogous to a spirit departing at death (with a suggestion of the impermanence of life).
The last two characters mean “of wind” or a possessive like “wind of...” but Japanese grammar will have the wind come last in the phrase.