WordPress at a glance
function is not described

woocommerce_review_display_gravatar() WC 1.0

Display the review authors gravatar

Hooks from the function
Return

null. Nothing.

Usage

woocommerce_review_display_gravatar( $comment );
$comment(array) (required)
WP_Comment.

Code of woocommerce_review_display_gravatar() WC 5.3.0

<?php
function woocommerce_review_display_gravatar( $comment ) {
	echo get_avatar( $comment, apply_filters( 'woocommerce_review_gravatar_size', '60' ), '' );
}