411 REFERENCE · Wiktionary
P0
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
en priority zero The highest, most critical, most important, level of importance and priority. A hold everything, drop everything, and get on it, level.
en P1 P2 P3 P4 P5
en position zero The ultimate first position, in ordinal systems that begin with the zeroth place.
en P1 (counting from 1)
See also
Appendix: Variations of "po"