Dharmachakra (Wheel of Dharma) amulets.
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The “Wheel of Dharma” (also called “Wheel of Law”)
is the symbol representing the doctrine and teachings of the Buddha.
It is one of the oldest Buddhist symbols, appearing since the time
of the Buddhist emperor Ashoka, even before any representation
of the Buddha in his human form.
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Dharmachakra amulets are relatively uncommon these days,
and mainly worn as sacred relics
transmitting the blessings of a Venerable
and as an aid to meditation and Dharma practice.