confectioners’ sugar means: Because it disintegrates better than regular sugar, powdered sugar works best for recipes such as frostings. It can also be sprinkled over baked goods. This is also called 10X sugar. It is also known as “icing sugar” in Great Britain. “. (in Cooking Dictionary)

What else does confectioners’ sugar mean?

Powdered sugar is a refined sugar that has been ground to a fine white powder which can be easily dissolved. Also known as 10X sugar or powdered sugar. (in Cooking Dictionary)

Pulverized sugar finely, often with cornstarch. (in Merlin Dictionary)