編集のアイコン

<span class="dli-edit"><span></span></span>

.dli-edit {
  display: inline-block;
  vertical-align: middle;
  color: #333;
  line-height: 1;
  width: 0.9em;
  height: 0.9em;
  border: 0.1em solid currentColor;
  border-radius: 0.1em;
  background: #fff;
  box-sizing: content-box;
  position: relative;
}

.dli-edit > span {
  font-size: 0.8em;
  position: relative;
  width: 1.05em;
  height: 0.2em;
  background: currentColor;
  border-radius: 0 0.075em 0.075em 0;
  transform: rotate(-45deg);
  transform-origin: left center;
  box-shadow: 0 0 0 0.125em #fff;
  position: absolute;
  top: 0;
  left: 50%;
  bottom: 0;
  margin: auto;
}

.dli-edit > span::before {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-color: transparent;
  border-width: 0.1em 0.15em;
  border-right-color: currentColor;
  border-left: 0;
  position: absolute;
  top: 0;
  right: 100%;
  bottom: 0;
  margin: auto;
}

.dli-edit > span::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 0.15em;
  border-left: 0.05em solid #fff;
  box-sizing: content-box;
}