411 REFERENCE · Wiktionary
PPB
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
ppb
English
Etymology 1
Noun
p
en parts per billion.
Etymology 2
Noun
en economics en production-possibility boundary.
Synonyms
economics en PPC, en PPF
Anagrams
en bpp BPP PBP bpp