PIO

U.S. Military.
1.
public information office.
2.
public information officer.

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Piolet
[pee-uh-ley] /ˌpi əˈleɪ/ noun 1. an ice ax used in mountaineering. /pjəʊˈleɪ/ noun 1. a type of ice axe n. 1868, from Savoy French piolet “climber’s ice-axe” (19c.), diminutive of piolo “axe,” perhaps from Medieval Latin piola “plane, scraper.”
Pio mode
programmed input/output mode
Pioneer
[pahy-uh-neer] /ˌpaɪ əˈnɪər/ noun 1. a person who is among those who first enter or settle a region, thus opening it for occupation and development by others. 2. one who is first or among the earliest in any field of inquiry, enterprise, or progress: pioneers in cancer research. 3. one of a group of foot […]

Pion
[pahy-on] /ˈpaɪ ɒn/ noun, Physics. 1. the first meson to be discovered: it has spin 0 and may be positively or negatively charged or neutral; charged pions decay into a muon and a neutrino or antineutrino. Symbol: π. /ˈpaɪɒn/ noun 1. (physics) a meson having a positive or negative charge and a rest mass 273.13 […]
Pioneer-day
noun, U.S. History. 1. a legal holiday in Utah on July 24 to commemorate Brigham Young’s founding of Salt Lake City in 1847.