drupal 8, commerce, get currency symbol

LovebooksHelperTraits.php

  /**
   * Get currency symbol.
   *
   * @param object $product_variation
   * @return string
   */
  public function getCurrencySymbol($product_variation) {
    $currency_code = $product_variation->get('price')->currency_code;
    $currency = Currency::load($currency_code);

    return $currency->getSymbol();
  }