Sensory Characteristics

Understanding WCAG2.0

The meaning of information is not provided only by the color, size, and position of the element.

Examples of NG include "round button" and "right button", but if you are carefully checking 1.3.1, it will almost be a satisfying item.

Principle Perceivable Information and user interface components must be presentable to users in ways they can perceive.
Guideline Adaptable Create content that can be presented in different ways (for example simpler layout) without losing information or structure.
Criterion Sensory Characteristics
(1.3.3 A)
The explanation for understanding and manipulating content does not rely solely on the sensory features of the constituent, such as shape, size, visual location, orientation, or sound.

URL of Techniques for WCAG 2.0