is there an alt text for mateiral ui icons code example

Example 1: display logo in material ui

<AppBar color="inherit">
    <Toolbar>
        <img src="logo.png" alt="logo" className={classes.logo} />
      </Toolbar>
</AppBar>

Example 2: react mui icons

npm install @material-ui/core
npm install @material-ui/icons

import RoomIcon from '@material-ui/icons/Room';

<RoomIcon />