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VVTL-i stands for "Variable Valve Timing and Lift Intelligent System."
This essentially means that not only can your engine variate your valve timing, it can control the amount of time that your intake and exhaust valves are lifted.
This concept was first used in the 1999 Celica (more specifically any engine considered 2ZZ-GE), which has since been discontinued due to its failure to meet Euro IV emissions requirements.
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