大方廣圓覺修多羅了義經略疏 2.601

2.601

四、三點齊修觀。三點者，梵之伊字。愨意云：「一人俱修三觀，即名為齊，非謂同時。」

4. The contemplation of cultivating the three dots together. The three dots refer to the Sanskrit letter 'i'. Que's meaning is: "One person cultivating all three contemplations together is called 'together'; it does not mean simultaneously."