It stands for
vb: Visual Basic
Cr: Carriage Return
Lf: LineFeed
In the ole days of typewriters the carriage return means to move the carriage all the way back left.
Linefeed simply is to push the paper in the typewriter up a line, giving a new blank line.
For a bit more Detail:
- vbCrLf = vbNewLine = chr(13) & chr(10)
On a interesting note you will find that Excel uses only chr(10) instead of the combination of the chr(13) and chr(10). I have on occasion when moving data back and forth between the Access and excel depending on how its done had to do a search and replace to get the conversion right.