OK Glass was the wake phrase for Google Glass, the head-mounted wearable computer Google began showing publicly in 2012 and released to early explorers in 2013. Saying the two words activated voice control, after which the wearer could ask for directions, take a photo or send a message without touching the device. Although Glass never became a mainstream consumer product, the phrase entered tech culture through launch videos, demos and parodies, and it remains a handy shorthand for talking to a gadget, especially when a creator wants a scene to feel futuristic or voice-controlled.