Pi Orionis is a group of fairly widely scattered star

Star

A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...

s in the constellation

Constellation

In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....

 Orion

Orion (constellation)

Orion, often referred to as The Hunter, is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous, and most recognizable constellations in the night sky...

 that constitute Orion's shield.

They form an exception to the general rule that stars that share the same Bayer designation

Bayer designation

A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...

 are close together: π¹ is nearly 9° north of π⁶ (Tau Eridani

Tau Eridani

Tau Eridani is a group of fairly widely scattered stars in the constellation Eridanus.They form an exception to the general rule that stars that share the same Bayer designation are close together: τ1 is nearly 20° away from τ9 .* τ1 Eri * τ2 Eri * τ3 Eri Tau Eridani (τ...

 is an even more noteworthy example of this).

• π¹ Ori (aka 7 Orionis)
• π² Ori (aka 2 Orionis)
• π³ Ori
  Pi3 Orionis
  Pi3 Orionis , formally designated Tabit, is a white F-type dwarf star approximately 26 light-years away in the constellation of Orion. It is thought that the star may, in fact, be a binary star system. Though no extrasolar planets have been observed around Pi3 Orionis, the star is considered a...
  
   (aka 1 Orionis)
• π⁴ Ori
  Pi4 Orionis
  Pi4 Orionis is a spectroscopic binary star in the constellation Orion. It is about 1,300 light years away and is one of the most luminous stars known. It is one of a series of stars that share the Bayer designation Pi Orionis....
  
   (aka 3 Orionis)
• π⁵ Ori (aka 8 Orionis, forms a visual double with 5 Orionis)
• π⁶ Ori (aka 10 Orionis)

All of them were member of asterism 參旗 (Shēn Qí), Banner of Three Stars, Net

Net (Chinese constellation)

The Net mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the western mansions of the White Tiger.-Asterisms:...

mansion.