Gellan gum is a commonly used ingredient in food production, but there are a few different names that it can go by. One common synonym for gellan gum is simply "E418", which is the code that it is given by the European Union for use in food products. Other names for gellan gum include "Gelrite", "Gelrite 5000", and "Phytagel", all of which are specific brand names for gellan gum products. It's important to note that while these names may be used interchangeably, they all refer to the same substance, which is a type of polysaccharide that is commonly used as a thickener or gelling agent in food products.