>> What is "10mil"? What unit is that?

> When discussing pcb specs the term mil typically reffers to a thousanth
> of an inch.
>
> This can be very confusing to people who take the term mil to mean
> millemeter.

It can. But using mil to mean 0.001 inch is far more established not only in 
PCB uage but in industry in general than using it to mean mm. The former is 
established "jargon" from time immemorial and the latter is less common and 
(arguably, of course) sloppy. The former takes a longish phrase and replaces 
it with a short contraction while the latter shortens analready short 
phrtase slightly

viz

    mils        ... thousandths of an inch ...
    mils        ... millimeters ...



YOMV of course :-)



            Russell

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