Passive Infrared. Widely used in devices to detect motion. A special lens on the front of the PIR divides the sensor into zones. A individuals body heat radiation is detected as it moves through the sensor zones in front of the PIR

Passive Infra Red movment detector.

Passive Infrared, basically it is a heat sensor, not a motion sensor.

a device that uses Infra Red energy to detect motion within the premise

abb. passive infra-red

Stands for Passive Infrared. This technology is used in motion sensors to detect movement. The devices are passive because, unlike a TV remote, they do not generate any infrared light - they only detect it. Infrared light can be generated by heat, so motion sensors with PIR can detect the heat produced by people and warm-blooded animals.

Pir is a term in Persian to refer to a pilgrimage site, most often one of the Zoroastrian faith. The six major Zoroastrian pir located in and around the city of Yazd, Iran are: Seti Pir, Pir-e Sabz (also known as Chak Chak), Pir-e Nāraki, Pir-e Bānu, Pir-e Herisht, and Pir-e Nārestān.

A Pir (Persian: پیر) in literal meaning defines as old (person).

Peak information rate. The PIR must be equal to or greater than the CIR, and both must be configured to be greater than 0. Packets that exceed the PIR are marked red, which corresponds to high loss priority. See also CIR and PIR.

Protein Information Resource

Protein Identification Resource International, a protein database vendor