Pi Gruis, an optical double with a variable component, is composed of Pi < sup > 1 </ sup > Gruis and Pi < sup > 2 </ sup >.

Pi < sup > 1 </ sup > is a semi-regular red giant with a minimum magnitude of 6. 7 and a maximum magnitude of 5. 4.

Pi < sup > 2 </ sup > is a white giant 132 light-years from Earth and is often brighter than its companion at magnitude 5. 6.

Pi Hydri, composed of Pi < sup > 1 </ sup > Hydri and Pi < sup > 2 </ sup > Hydri, is divisible in binoculars.

Pi < sup > 1 </ sup > is a red star of magnitude 5. 6, 740 light-years from Earth.

Pi < sup > 2 </ sup > is an orange star of magnitude 5. 7, 468 light-years from Earth.

The product operator for the product of a sequence is denoted by the capital Greek letter Pi < span style =" font-family: times, serif ; font-size: 150 %">∏</ span > ( in analogy to the use of the capital Sigma < span style =" font-family: times, serif ; font-size: 150 %">∑</ span > as summation symbol ).

Pi Approximation Day is observed on July 22 ( or 22 / 7 in day / month date format ), since the fraction < sup > 22 </ sup >⁄< sub > 7 </ sub > is a common approximation of π.

< td > Fu Pi ( 苻丕 Fú Pī )</ td >

Therefore, the least significant known bit of Pi is 1 at position 1, 000, 000, 000, 000, 060 ( one quadrillion sixty ) or 10 < sup > 15 </ sup >+ 60.

The pebibit is a multiple of the bit, a unit of digital information storage, prefixed by the standards-based multiplier pebi ( symbol Pi ), a binary prefix meaning 2 < sup > 50 </ sup >.

* Pi Gamma Mu ( ΠΓΜ ) – 1924 ; co-ed social sciences honor society < nowiki >*</ nowiki >

Pi < sup > 3 </ sup > Orionis ( π < sup > 3 </ sup > Ori, π < sup > 3 </ sup > Orionis ) is the Bayer designation for a star in the equatorial constellation of Orion.

Pi Day is observed on March 14 ( or 3 / 14 in month / day date format ), since 3, 1 and 4 are the three most significant digits of π in the decimal form.

Special radiation-hardened and otherwise somewhat modified S / 360s, in the form of the System / 4 Pi avionics computer, are used in several fighter and bomber jet aircraft.

In the complete 32-bit AP-101 version, 4 Pi machines are used as the replicated computing nodes of the fault-tolerant Space Shuttle computer system ( in five nodes ).

The latter include San Fulgencio ( 80 %), Rojales ( 74 %), Benitatxell ( 69. 8 %), Algorfa ( 69. 7 %), Llíber ( 67 %), Teulada ( 65. 5 %), Daya Vieja ( 64. 4 %); San Miguel de Salinas ( 64. 3 %), Calp ( 62. 8 %), Els Poblets ( 61. 6 %), Alcalalí ( 60. 8 %), Benijófar ( 58. 5 %), L ' Alfàs del Pi ( 56. 6 %), Orba ( 55 %), Xàbia ( 54 %), Torrevieja ( 53. 5 %), Murla ( 52 %), Fondó ( 51. 7 %), and Benidoleig ( 50 %).

The benefit of the new formula, a variation on the Gregory / Leibniz series ( Pi / 4 = arctan 1 ), was that it had a significantly increased rate of convergence, which made it a much more practical method of calculation.

* Non-driving motor: Be 4 / 4 Pi 87, 88, 89

* System 4 Pi, an IBM family of avionics

The IBM System / 4 Pi is a family of radiation hardened avionics computers used, in various versions, on the B-52 Stratofortress bomber, the F-15 Eagle fighter, E-3 Sentry, NASA's Skylab space station, MOL, and the Space Shuttle, as well as other aircraft.

The top-of-the-line 4 Pi is the AP-101, used in the B-52.

The name of the system is derived from the fact that the angular measure of a complete sphere ( solid angle ) is 4π steradians, while the angular measure of a complete circle is 360 degrees ; hence System / 4 Pi and System / 360.

This implies that System / 4 Pi is a version of the IBM System / 360 for the three-dimensional world of avionics.

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* The System / 4 Pi, made by IBM and used on board the Space Shuttle ( AP-101 variant ), is based on the System / 360 architecture.

Membership in Phi Sigma Pi is open to students at four-year collegiate institutions who have earned a 3. 00 cumulative grade point average ( on a 4. 00 scale, where 4. 00 is equivalent to a grade of " A ") for at least one semester or quarter of collegiate work.

( α-1, 4 glycogen chain )< sub > n </ sub > + Pi ↔ ( α-1, 4 glycogen chain )< sub > n-1 </ sub > + D-glucose-1-phosphate.

Pi Serpentis is a white A-type main sequence dwarf with an apparent magnitude of + 4. 82.

Pi < sup > 3 </ sup > Orionis is the brightest star in the lion's hide ( or shield ) that Orion is holding.

Though no extrasolar planets have been observed around Pi < sup > 3 </ sup > Orionis, the star is considered a prime location for planets as small as the Earth.

Pi < sup > 3 </ sup > Orionis is a main-sequence star of spectral type F6 V. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.

Pi < sup > 3 </ sup > Orionis is most likely single ; a nearby star is probably an optical companion.

No substellar companion has been detected so far around Pi < sup > 3 </ sup > Orionis and the McDonald Observatory team has set limits to the presence of one or more planets with masses between 0. 84 and 46. 7 Jupiter masses and average separations spanning between 0. 05 and 5. 2 astronomical units.

* Pi Orionis

It is one of a series of stars that share the Bayer designation Pi Orionis.

Pi Orionis ( π Ori, π Orionis ) is a group of fairly widely scattered stars in the constellation Orion that constitute Orion's shield.

Orionis, Pi

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They form an exception to the general rule that stars that share the same Bayer designation are close together: τ < sup > 1 </ sup > is nearly 20 ° away from τ < sup > 9 </ sup > ( Pi Orionis is another example of this ).