びっくりマーク、エクスクラメーションマークのアイコン

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

.dli-exclamation {
  display: inline-block;
  vertical-align: middle;
  color: #333;
  line-height: 1;
  width: 0.15em;
  height: 0.9em;
}

.dli-exclamation::before, .dli-exclamation::after {
  content: '';
  display: block;
  width: inherit;
  background: currentColor;
}

.dli-exclamation::before {
  margin-bottom: 0.1em;
  height: 0.65em;
  border-radius: 0.025em;
}

.dli-exclamation::after {
  height: 0.15em;
  border-radius: 50%;
}