psi

Pronunciation:  UK [psaɪ] [saɪ]
  • abbr.(=
  • n.Greece 23rd letter of alphabet
  • WebPressure on Proliferation Security Initiative PSI (Proliferation Security Initiative), pre-shipment inspection (Pre-shipment Inspection)
abbr.
1.
[ Education](= personized system of instruction) 
2.
[ Environmental Protection](= pollution standard index)