"Touchless gestures" refers to the ability to interact with something without physically touching it. It involves using hand or body movements to control and navigate a device or system, without the need for direct contact. Full definition
For future iPhones, Apple is said to be working on touchless gesture controls and curved screens, features that could launch within three years. (macrumors.com)
For example, if Apple is indeed working on touchless gesture control, a slight curve could help Apple better position cameras and sensors in order to detect movements close to the screen. (bgr.com)
Recent reports claim Apple is working on an iPhone with touchless gesture control and / or a curved screen, while its main rival is working on the first foldable Samsung Galaxy X and a Samsung wearable that wraps around our wrists and can be configured into an upright position to be used like a smartphone. (cnbc.com)