| Data type | Prefix | Example |
| Boolean | bln | blnFound |
| Byte | byt | bytRasterData |
| Collection object | col | colWidgets |
| Currency | cur | curRevenue |
| Date (Time) | dtm | dtmStart |
| Double | dbl | dblTolerance |
| Error | err | errOrderNum |
| Integer | int | intQuantity |
| Long | lng | lngDistance |
| Object | obj | objCurrent |
| Single | sng | sngAverage |
| String | str | strFName |
| User-defined type | udt | udtEmployee |
| Variant | vnt | vntCheckSum |