This coding style is specifically called out in the Object Pascal Style Guide as not being Hungarian notation (with one exception, enumerated types.)
The specific coding conventions you're talking about don't have a name as such, as far as I know, it's simply that you're writing code conforming to the CodeGear (old Borland) coding style guide. The guide doesn't seem to give the style a name.
The reason you see it a lot in the Delphi source is because this guide is based on the coding style the Delphi team developed!
This document's well worth reading - not only for code guidelines but also out of interest for other things it mentions.
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