The “C” button’s function is vestigial. Back when calculators were commercialized, starting in the mid-1960s, their electronics were designed to operate as efficiently as possible.

People are just learning what the C, CE, and AC buttons on calculators mean as they share their shock after realising they all have different meanings and purposes which can make it easier to use ...

People have been baffled after 'finally' learning what the letter buttons C, CE, and AC stand for on a calculator and how to use them, with some people saying they've been curious for years ...

In the study, the man had a $50,000 super fund balance and earned $50,000 a year. In each case, ASIC relied on the calculators' default rates of return and values for fees and charges.

Amnesty's 'Panic Button' app will continue to be developed throughout the end of this year, and you can check out the status of the project and its uses around the world on their blog.

The calculators, which contain deadly Lithium batteries, were sold at BIG W stores nationally from December 30, 2014 to July 22, 2016.