In the context of railway ticket booking, NC stands for "No Choice". This means that the passengers preferred berth choice was not available and they were allotted a different berth. For example, if a passenger selects a window seat preference but that seat is not available, it will be indicated as NC in the ticket and another seat will be allotted. It is important to note that NC is not a confirmed status, and the ticket may still be in the waiting list or RAC (Reservation Against Cancellation) status.