What is a picture symbol on a computer’s desktop called: an icon or a stamp？
A symbol for an item in a calculation or scientific formula is a number, letter, or shape that represents that item. 符号
The desktop of a computer is the display of icons that you see on the screen when the computer is ready to use. (电脑) 桌面
An icon is a picture on a computer screen representing a particular computer function. If you want to use it, you move the cursor onto the icon using a mouse. (电脑屏幕上可用鼠标点击的) 图标 [计算机]
A stamp or a postage stamp is a small piece of paper which you lick and stick on an envelope or package before you mail it to pay for the cost of the postage. 邮票
What is an icon
In a computer’s graphical user interface ( GUI ), an icon is an image that represents an application, a capability, or some other concept or specific entity with meaning for the user. An icon is usually selectable but can also be a nonselectable image such as a company’s logo.