And for today's rant, you can also say Pi = 3 and be precise. Significant figures are a common shorthand for in-band signaling of error, but they're not the onl

And for today's rant, you can also say Pi = 3 and be precise. Significant figures are a common shorthand for in-band signaling of error, but they're not the only tool and are really only useful insofar as they're pretty easy to do mental math with and relatively well known.