@activelylearn/material-ui/packages/material-ui-icons/src/ExpandMore.js

Material-UI's workspace package

import React from 'react';
import createSvgIcon from './utils/createSvgIcon';

export default createSvgIcon(
  <g><path d="M16.59 8.59L12 13.17 7.41 8.59 6 10l6 6 6-6z" /></g>
, 'ExpandMore');