The O/U certifies Scharffen Berger Chocolate Tasting Squares a an O/UD (dairy) product. Some boxes of 48-5 oz. Tasting Squares bear a plain O/U symbol, without the “D” (dairy) designation.
From The KIB: Pesach News – Avocado Oil and Spray
All Pure Virgin Avocado Oil & Spray (without additives), are fine for use on Pesach without a special Pesach designation on the label.