IOS

Background
iOS is the operating system for Apple's iPhone, iPad and formerly iPod Touch. A rebranded version of iOS is currently used on the iPad, called iPadOS.

(June 29, 2007-)
Logo:
 * 2007-2012 (iPhone OS 1.0-iOS 6.0): On a black background, we see the Apple logo with a white gradient with curves running through it.
 * 2013- (iOS 7.0+): On a black background, we see the Apple logo in solid white.

Variant: Some Apple devices prior to the iPhone X with a light color tone may have the colors inverted (so that will be white background and black logo).

Technique: None.

Music/Sounds: None.

Availability: Extremely common. Seen when you boot up an iOS device.