drawing
I saw this on a package drawing in a BC847 datasheet:
What do the numbers mean? They look like a date, but the SOT883 package is much more recent than 2003. (By the way, the numbers on the drawings for the other packages are "04-11-04", also palindromic. Coincidence?)
The 0.7 is the distance from the center of the smaller (contact) pads to the edge of the larger (mechanical) pad.
The 1.2 is the width of the larger pad.
Notice the dot both arrows point to.
edit
You'll often see the indication BSC next to one of the measurements. This means Basic Spacing between Centers and is a nominal value. Could have been given here next to the 1mm (pitch) value, or next to a 6mm value between centers of first and last pad.
See note 2: Can be visible in some manufacturing processes.
My guess is that there may be some exposed copper in this area.
Best Answer
It is the drawing issue date in ISO order (YY-MM-DD). It's paired with the symbol for first angle orthographic projection, so obviously belongs in a title block of a full drawing. Below is part of a title block of a more complete NXP drawing.
Edit: as confirmation see the NXP package drawing, which bears the same April 3, 2003 date.
Edit2: The date format is specified to follow ISO order even in the ASME (U.S.) version of the GD&T standard as follows:
This is somewhat controversial (in the U.S. anyway).