oz - µm -> How much (in oz weight) copper is used on a size ?? PCB with a cladding of µm thikness.. (How big is the reference Board for this ? 1meter x 1 meter ? )
Ounces per square foot, as already mentioned - it's the other common way to express the cladding thickness.
SMD footprints -> OK, size diagram including 4 examples. including new and (old) SMD size codes. What does the POW column mean ?
Guessing at this one, but typical power ratings in watts for those footprints?
Max A SMOBC @ 0.5 oz -> WTF ? I have no idea what this is about ?
Max A SMOBC @ 1.0 oz -> WTF ? I have no idea what this is about ?
Current-carrying capacity of traces in 0.5 / 1 oz thick copper - the figures are trace width in mils, amps per ten/five/one degree rise above ambient temperature, and (I think) milliohms per inch of trace length. SMOBC = Solder Mask Over Bare Copper.
SQ PIN to DIA mm -> Again, I have no idea what this is about ? Inner surface area of a via maybe ?
Conversion between the size of a square pin and its bounding circle (-> the size of a hole to accommodate it).
EIA SMD TANTALUM -> Nope, does not ring a bell…
Standard case sizes of SMD tantalum caps.