noun
notification area; system tray
Refers to the area on a desktop taskbar (often Windows) where system and application icons and notifications appear. Cross-referenced with タスクトレイ.
See also: タスクトレイ
通知領域に新しいアイコンが表示された。
A new icon appeared in the notification area.
noun
notification bar; notification drawer
Specifically used for the pull-down notification area on Android devices.
Androidの通知領域を下にスワイプして確認する。
Swipe down the notification bar on Android to check.
タスクトレイ is a more specific term for the system tray on Windows, while 通知領域 is a broader term that can also refer to the notification area on Android.
Compound of 通知 (notification) and 領域 (area, region). A modern computing term.