In the European Union, gum arabic appears on ingredient lists either by name or as E414, its designated additive number in the thickeners and stabilizers range. In the United States, labels typically use the terms "gum arabic," "acacia gum," or "gum acacia" rather than an E number, since the E-number system is a European convention.
A newer labeling angle worth knowing: gum arabic is increasingly sold and declared as "acacia fiber" or "soluble acacia fiber," particularly in fiber-fortified foods, protein bars, and supplement powders. This is the same substance, marketed for its soluble dietary fiber content rather than its stabilizing function.
All of these names refer to a plant-derived ingredient, so none of them signals an animal-derived component. Vegans reading labels do not need to investigate further when any of these terms appears; the only practical concern is not to confuse it with animal-derived ingredients such as gelatin, which is declared separately by name on ingredient lists.