"What is the left side called in English?"
This question can be answered in a few different ways depending on the context, but if you're asking about the physical side of something, it would typically be referred to as "the left." For example, in a two-sided document, the left side would be the one that faces the reader. If you're asking about someone's position relative to another person or object, it could be said that they are on the "left" side of something. In terms of spatial orientation, things that are positioned to the left of another object are considered to be on the left side of that object.