According to WCAG 1.3.3 Sensory Characteristic (A), all learners, including those with disabilities, should be able to understand instructions for online content, even when they cannot perceive visual cues like shape, color, size, visual location, or auditory cues like sound. The best practice is to include a secondary indicator and include more than one way to convey the meaning.
Here are some examples of what you should avoid and how to make them more accessible:
Don't just refer to items by their location. Those who cannot see the screen may not be able to see it. Instead of saying "icon at the top left", say "menu icon". You can be more specific and say "menu icon at the top left".
Don't just refer to items by their color. It may cause problems for those that cannot see or distinguish between colors. Instead of saying "pink button", give the name of the button, for example: "Submit button".
Don't just refer to items by their shape. Those who cannot see the screen or don't understand shapes in English may have trouble with it. Instead of saying "triangles", be more specific. For example, say "the first 3 items".
When using meaningful sounds, add on-screen cues too. People with hearing impairments might miss important information if you don't. Instead of just using a beep sound to indicate an error, have some visual indication (like an error icon) appear on the screen.