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Subsequently, one may also ask, what is the difference between Torx and star?
Torx Drive The straight sides of the Torx six sided star shaped socket helps prevent camout and require lower end-load than cruciform systems. But wide tolerances can present a loose fit between the driver tool and the screw head socket and the 15 degree drive angle can reduce the tool bit life.
Keeping this in view, is Torx the same as hex?
However, Torx keys have a six-pointed star-like shape, instead of the six flat sides of a hex key. Unlike hex keys, which usually have a hexagonal cross-section along their entire length, Torx keys frequently have a circular cross-section, with the Torx shape only appearing at the ends of the tool.
As others have said there are no English or Metric Torx just Torx. The 1/4" & 3/8" drive ones are the "security" ones with a hole in the end of the bit to fit over a knob in the Torx fastener. They work on regular Torx fasteners as well. Here's a sample of a metric torx screw; notice the measurements are metric.