1. thermal relief:used instead of regular pads absorb heat conducted through connect lines, thermal relief can be :
a. a negative pad on a positive copper area(shape).the thermal relief may be plotted as a regular pad flash(circle)with two line.
b. a positive pad on an embedded metal layer that distributes a voltage, such as power or ground.
2. anti pad: negative pads, usually a circle , to prevent connection of a pin to an embedded metal layer.
3. flash: user defined name of aperture for Gerber flashing of unique pad shape.
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