A handful of elements that make up the iOS UI in its entirety are round or have rounded corners; this includes, but is not limited to: passcode buttons, Control Center toggles, the corners of banner notifications, and Home screen folders, among other things.

If you're not a fan of this system-wide rounded style, a new free jailbreak tweak called ringUI by CydiaGeek can be installed to make several elements on your device look much squarer.

After you install ringUI, a new preferences pane is added to the Settings app so you can remove the roundness effects from a number of things in iOS:

There are four separate toggle switches, each of which handle their own handful of elements. Among the things the tweak can modify are:

Notification banners

Notifications in Notification Center and on the Lock screen

Widgets in Today view

Folder icons on the Home screen and folder backgrounds

Passcode number pad buttons

Control Center toggle buttons

App Switcher cards

Once you adjust the settings the way you want, you can tap on the respring button at the bottom of the preferences pane to save your changes.

Because ringUI is an aesthetic tweak, whether or not it looks good to you will come down to personal opinion. Installing the tweak won't impact the usability of your device in any way, as it's simply intended to let you to make your device look different from everyone else's.

If you're interested in trying ringUI, you can grab it for free from Cydia's BigBoss repository. The tweak works on jailbroken iOS 8, 9 and 10 devices.

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