I would recommend using 'cream' and avoiding this tag entirely.
Half-and-Half, also known as "half cream", is a blend of equal parts whole milk and light cream. It averages between 10 and 12% fat.
But there are also the drink blends of iced tea & lemonade (aka. an Arnold Palmer) and a stout and pilsner (aka a Black and Tan) that make this tag really ambiguous. And it has even more meanings in other languages : https://en.wikipedia.org/wiki/Half_and_half