Laundry-symbol-wash-95.svg.png. Niels Bosboom via Wikimedia Commons // ... There may also be an “X” over a pair of vertical lines beneath the iron, which means that steam should not be used.

In combining the 1 and 0 together, the power symbol was born: a large circle (0) interrupted by a small vertical line (1). This language-agnostic design was meant to convey that a switch or button ...