ChatGPTとBingを使って理想のベクターアイコンをデザインする方法

I entered the following prompt, but it doesn't quite match the desired image with [variable]. 
Can you please add an explanation for [variable] and improve the prompt to get the desired output?
"""
Design a simple and minimalist black vector icon representing a [variable].
The icon should be easily recognizable and adhere to accessibility guidelines.
Consider using bold lines and geometric shapes to create a clean and modern design.
Be mindful of negative space to ensure the icon is legible at different sizes.
[variable]:欲しいアイコンの説明