: What is this triangular part of a sidebar menu called? I've circled it in red. What is the design name of this element?

@Sent7350415

Some people call it an arrow or a caret that enables a slide-out of content or a popup can display some sort of information. In this particular instance it would appear it is for the navigation. Since you tagged this with CSS I included an example of how to create it:

.arrow_box {
position: relative;
background: #b34ae5 ;
}
.arrow_box:after {
left: 100%;
top: 50%;
border: solid transparent;
content: " ";
height: 0;
width: 0;
position: absolute;
pointer-events: none;
border-color: rgba(179, 74, 229, 0);
border-left-color: #b34ae5 ;
border-width: 30px;
margin-top: -30px;
}


Caret question in regards to Boorstrap that might help you: "How is the caret on Twitter Bootstrap constructed?"

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