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A ZAMO frame (for zero angular momentum frame) is a frame of reference that is not rotating, i.e., has no angular momentum. The term is commonly used in descriptions of general-relativity phenomena. An inertial reference frame (that is not accelerating) is definitely a ZAMO frame, but the term ZAMO is generally used for non-everyday cases, such as strong-field gravity, that have a more complex relation between frames of reference. For example, due to frame dragging, a ZAMO frame can be rotating in relation to another. Another term for such a ZAMO frame is a locally non-rotating frame or LNRF.