Tokyo Exchange Scraps $617B of Stock Trades

A significant number of stock orders were canceled in Japan, surpassing the economic size of Sweden. The cancellations, attributed to a trading error, affected major companies like Toyota, Honda, and Sony. One order involved more than half of Toyota's outstanding shares. The issue may have been a 'fat finger' error, with trades conducted over-the-counter, meaning directly between parties without exchange supervision.

Which major automaker had an order for more than half of its outstanding shares cancelled?

What does the term 'fat finger problem' refer to in the context of stock trading?