| Abbreviation | Definition |
|---|---|
| YPA | Yearly Plan of Action |
| YPA | Yellow Pages Advertising |
| YPA | Young Professionals Attachment |
| YPB | Yellow Page Boundaries |
| YPD | Yellow Page Directory |
| YPE | Your Persons Economy |
| YPI | Yearly Planning Instrument |
| YQZ | Your Quality Zone |
| yr | year |
| yymmdd | year month and date |
| yymmdd | year month day |
| YYQ | Year (2-digit), Quarter |
| YYYY | Four-digit Year |
| Z | Effort |
| ZAGF | Zurich Administradora General de Fondos |
| ZI | Zero Information |
| ZIFA | Zanzibar Institute of Financial Administration |
| ZOPA | Zone Of Possible Agreement |
| ZPE | Zero Point Employment |
| ZQC | Zero Quality Control |