I usually use that kind of speechless emoticon if I want to terminate a fight with the other person.
Nowadays there are more of those kind of funny pictures, so when people are bored sometimes, when they are chatting, you will send a picture to send a picture to make each other laugh and smile. But I for one don't really collect these pictures. So every time I rack my brain to find them there. Then when I can't find it, I look up the previous pictures. After I've used the previous picture more than ten times, I feel that there is no way to fight anymore, and then I'll make a very speechless picture.
There are a lot of speechless pictures out there, even if you don't find them yourself, the ones that come with WeChat are the ones that come with basically every series. Some diagrams are not necessarily speechless, he may be the kind of black line feeling. Or it could be the feeling of cold sweat, or it could be the feeling of glancing at you and then not speaking. These are all diagrams that indicate speechlessness. Usually I'll post this look to end the boring conversation.