A timepiece set in advance to startle a person awake at the designated time with its two bells. That is, before hitting snooze. Appearance varies across platforms, but depicted as a classic, wind-up, bedside alarm clock, often red in color.
May be used for various content concerning alarms, alerts, sleeping, waking, and time more generally.
Alarm Clock was approved as part of Unicode 6.0 in 2010 and added to Emoji 1.0 in 2015.