WordPress at a glance
function is not described

woocommerce_simple_add_to_cart() WC 1.0

Output the simple product add to cart area.

No Hooks.

Return

null. Nothing.

Usage

woocommerce_simple_add_to_cart();

Code of woocommerce_simple_add_to_cart() WC 5.3.0

<?php
function woocommerce_simple_add_to_cart() {
	wc_get_template( 'single-product/add-to-cart/simple.php' );
}