2. Initialism. parts per billion ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of PPB
| POST POTD POTS POTUS POUM POV POVs POW POW camp POWs | PO Box No PO box PO box number PP PP&H PPB (current term) PPE PPG PPH PPI | PPK PPL PPLO PPO PPP PPPS PPPoA PPPoE PPPoEs PPR |
Other Resources:
