π
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Ancient Greek
Symbol
π
- A fraction of one quarter in the acrophonic numeral system that predated the gematria system. Equivalent to the Roman compound Β·Β·Β·, or equivalently β΄ (3β12).
Usage notes
π may be used alone or appended to units, as in ΞΞΞπ (3ΒΌ) and π π (5ΒΌ).