octahedron

<svg
  xmlns="http://www.w3.org/2000/svg"
  width="24"
  height="24"
  viewBox="0 0 24 24"
  fill="none"
  stroke="currentColor"
  stroke-width="2"
  stroke-linecap="round"
  stroke-linejoin="round"
><path stroke="none" d="M0 0h24v24H0z" fill="none" /><path d="M12.859 21.652l8.845 -8.949a.984 .984 0 0 0 0 -1.407l-8.845 -8.948a1.233 1.233 0 0 0 -1.718 0l-8.845 8.949a.984 .984 0 0 0 0 1.407l8.845 8.949a1.234 1.234 0 0 0 1.718 -.001" /><path d="M2 12c.004 .086 .103 .178 .296 .246l8.845 2.632c.459 .163 1.259 .163 1.718 0l8.845 -2.632c.195 -.07 .294 -.156 .296 -.243" /><path d="M12 2.12v19.76" /></svg>

<i class="ti ti-octahedron"></i>

ti ti-octahedron

<i class="ti ti-018260"></i>

ti ti-018260

<svg
  xmlns="http://www.w3.org/2000/svg"
  width="24"
  height="24"
  viewBox="0 0 24 24"
  fill="none"
  stroke="currentColor"
  stroke-width="2"
  stroke-linecap="round"
  stroke-linejoin="round"
><path stroke="none" d="M0 0h24v24H0z" fill="none" /><path d="M12.859 21.652l8.845 -8.949a.984 .984 0 0 0 0 -1.407l-8.845 -8.948a1.233 1.233 0 0 0 -1.718 0l-8.845 8.949a.984 .984 0 0 0 0 1.407l8.845 8.949a1.234 1.234 0 0 0 1.718 -.001" /><path d="M2 12c.004 .086 .103 .178 .296 .246l8.845 2.632c.459 .163 1.259 .163 1.718 0l8.845 -2.632c.195 -.07 .294 -.156 .296 -.243" /><path d="M12 2.12v19.76" /></svg>

<svg
  xmlns="http://www.w3.org/2000/svg"
  width="24"
  height="24"
  viewBox="0 0 24 24"
  fill="none"
  stroke="currentColor"
  stroke-width="2"
  stroke-linecap="round"
  stroke-linejoin="round"
><path stroke="none" d="M0 0h24v24H0z" fill="none" /><path d="M12.859 21.652l8.845 -8.949a.984 .984 0 0 0 0 -1.407l-8.845 -8.948a1.233 1.233 0 0 0 -1.718 0l-8.845 8.949a.984 .984 0 0 0 0 1.407l8.845 8.949a1.234 1.234 0 0 0 1.718 -.001" /><path d="M2 12c.004 .086 .103 .178 .296 .246l8.845 2.632c.459 .163 1.259 .163 1.718 0l8.845 -2.632c.195 -.07 .294 -.156 .296 -.243" /><path d="M12 2.12v19.76" /></svg>

https://cdn.jsdelivr.net/npm/@ticnob/icons@1/icons/octahedron.svg