What does a 270 degree crank mean?

Excuse me, could you please clarify what is meant by a "270 degree crank" in the context you're referring to? Is it related to some specific mechanical component, such as an engine or a machine? Or perhaps it's a term used in a particular industry or technical field? I'm interested in understanding the exact meaning and relevance of this term. Could you provide more details or an example to help me grasp the concept better? Thank you.