This is the han hanging outside Treeleaf Zendo in Tsukuba, Japan. I just participated in a 2-day online retreat with the Treeleaf sangha around the world. The han functions as a sort of wooden “bell”, struck to start the retreat. It reads:
“Life and death are the great matter.
To waste time is a pity.
All is impermanent and passes swiftly away.
Time waits for no one.”