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I wasn't actually talking about the circumference per se, just that Balsamiq has come "full circle" which I represented using pi.

I know it's just a saying, but taken literally, "coming full circle" would mean the circumference. That is, going around in a circle.

actually, when a circle's diameter is 1, its circumference is π

I think "unit circle" means a circle with a radius of 1, not a diameter of 1: http://everobotics.org/projects/roboMagellan/img/UnitCircle....