What is helix on iPhone?

Could you please elaborate on what "helix" refers to in the context of an iPhone? Is it a specific app, a feature within the iOS operating system, or perhaps a term related to the device's hardware or software development? Without further context, it's difficult to provide a definitive answer. Could you provide more information about what you're referring to, or perhaps clarify the context in which you encountered the term "helix" on an iPhone?