octagon

<svg fill="currentColor" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="M188.6 .1c-17 0-33.3 6.7-45.3 18.7L19.2 143C7.2 155 .5 171.2 .5 188.2l0 135.6c0 17 6.7 33.3 18.7 45.3L143.4 493.2c12 12 28.3 18.7 45.3 18.7l135.6 0c17 0 33.3-6.7 45.3-18.7L493.6 369c12-12 18.7-28.3 18.7-45.3l0-135.6c0-17-6.7-33.3-18.7-45.3L369.5 18.8c-12-12-28.3-18.7-45.3-18.7L188.6 .1z"/></svg>

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

ti ti-octagon

<i class="ti ti-018237"></i>

ti ti-018237

<svg aria-hidden="true" focusable="false" fill="currentColor" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="M188.6 .1c-17 0-33.3 6.7-45.3 18.7L19.2 143C7.2 155 .5 171.2 .5 188.2l0 135.6c0 17 6.7 33.3 18.7 45.3L143.4 493.2c12 12 28.3 18.7 45.3 18.7l135.6 0c17 0 33.3-6.7 45.3-18.7L493.6 369c12-12 18.7-28.3 18.7-45.3l0-135.6c0-17-6.7-33.3-18.7-45.3L369.5 18.8c-12-12-28.3-18.7-45.3-18.7L188.6 .1z"/></svg>

<svg aria-hidden="true" focusable="false" fill="currentColor" viewBox="0 0 512 512" xmlns="http://www.w3.org/2000/svg"><path d="M188.6 .1c-17 0-33.3 6.7-45.3 18.7L19.2 143C7.2 155 .5 171.2 .5 188.2l0 135.6c0 17 6.7 33.3 18.7 45.3L143.4 493.2c12 12 28.3 18.7 45.3 18.7l135.6 0c17 0 33.3-6.7 45.3-18.7L493.6 369c12-12 18.7-28.3 18.7-45.3l0-135.6c0-17-6.7-33.3-18.7-45.3L369.5 18.8c-12-12-28.3-18.7-45.3-18.7L188.6 .1z"/></svg>

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