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In page Recorder (musical instrument):

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Pitches are produced on the recorder by covering the holes while blowing into the instrument. Modern terminology refers to the holes on the front of the instrument using the numbers 1 through 7, starting with the hole closest to the beak, with the thumbhole numbered hole 0. At the most basic level, the fingering technique of the recorder involves the sequential uncovering of the holes from lowest to highest (i.e., uncovering 7, then uncovering 7 and 6, then uncovering 7, 6, and 5, etc.) producing even higher pitches. In practice, however, the uncovering of the holes is not strictly sequential, and the half covering or uncovering of holes is an essential part of recorder technique.[citation needed]