Sentence:  In addition to placing <WSD>emoticons</WSD> by clicking icons in the pop-up panel shown in Figure 4-2, you can enter the text representation in your text chat window. For example, to show the image of the <WSD>emoticon</WSD> with sunglasses, you enter (cool). 
Meaning of the word marked with <WSD> tags:  An image or graphic icon used to represent such emotions; an emoji.