Clearly the asterisk is a popular web standard for identifying unconditionally required fields.
But what if any one field out of several is required? For example, there are separate fields for home phone, work phone, and cell phone. At least one phone number of any kind is required.
Do people usually just indicate this using in-page instructions? Instructions aren't very elegant, but it seems like asterisk variations (hatchet, cross, etc) usually just confuse people. Is there a better solution?