Vigilance

Vigilance is the act of watching for something to happen, of watching for danger. It is not something that humans are very good at, since it is difficult to maintain attention for very long without some stimulus. A security guard is just one of many occupations where vigilance is a primary duty.

In the card game Magic: The Gathering, vigilance is a common ability given to creatures allowing the creature to attack without "tapping". The effect of vigilance has been around for a long time, but has only recently been named.