Icon instead of text on button

Hi,

I have this function to edit the add to cart to show “info” instead and the link to the product.

add_action('woocommerce_after_shop_loop_item','replace_add_to_cart');
function replace_add_to_cart() {
global $product;
$link = $product->get_permalink();
echo do_shortcode('<center><a href="'.$link.'" class="button addtocartbutton">Info</a></center>');
}

I would like to change the “info” or whatever is the echo .. to be able to show an unicode icon or awesome font.

Thanks