where did the power button symbol come from
Power symbol The well-known on/off power symbol was the result of the logical evolution in user interface design. Originally, most early power controls consisted of switches that were toggled between two states demarcated by the words On and Off. As technology became more ubiquitous, these English words were replaced with the universal symbols line "|" and circle "o" (typically without serifs) to bypass language barriers. This standard is still used on toggle power switches.
V sign A commonly repeated legend claims that the two-fingered salute or V sign derives from a gesture made by longbowmen fighting in the English and Welsh[27] archers at the Battle of Agincourt (1415) during the Hundred Years' War, but no historical primary sources support this contention.[28] This origin legend states that archers who were captured by the French had their index and middle fingers cut off so that they could no longer operate their longbows, and that the V sign was used by uncaptured and victorious archers in a display of defiance against the enemy. However, it was common practice in warfare of that period to summarily execute common soldiers, since they held no ransom value.