This video demonstrates the Turntablist Transcription Method (TTM), a system of notation designed for transcribing turntablism.
It's similar to some methods for notating percussion performance, representing time from left to right and using a variety of symbols to represent the sound that should be played at that time and how it should be played.
TTM is based on a grid that subdivides the beats of the song being played. This grid consists of thicker lines to separate the beats, and thinner lines for subdivisions within the beat. Lines are drawn going in an upward motion to indicate that the record is going forwards and downward to indicate that the record is going backwards.
This method is read from left to right and the lines drawn represent the scratches, which slant from left to right. Slower movements are always slanted but appear to be 45 degrees or less from the horizontal axis and faster movement appear greater than 45 degrees but never can fully reach a 90 degree angle from the horizontal access.
Due to the fact that a turntablist is always scratching a music sample, the word or name of the sample is listed to the left of the grid.
Se the link below for more information on TTM notation.