A plus sign in a circle or an add button.

Add Button

Plus Icon

A vertical volume slider with an oval outline and a speaker icon at the bottom.

Two icons of a plus button and a sound control icon.

A plus button at the corner of a bell notification icon.

A smart cellphone with blank, large screen, a home button on the screen, and two volume buttons on the side.

A volume icon with a speaker and sound waves.

An icon of a shopping cart with a plus button over it.