It stands for Watt-Hour and in Toyota hybrids it tells you how much energy was recovered by the regenerative braking and stored in the HV battery instead of being wasted as heat in the brake rotors and drums.
On your home electric bill you are billed in Kilowatt-hours which is 1000 watt-hours. Each icon on the consumption screen is 50 watt-hours which is 50 watts for 1 hour, 500 watts for 6 minutes, 5000 watts for 36 seconds, etc.
In this case more is better and you can improve the number that show up and thus your fuel economy by letting off the throttle sooner and by braking as lightly as possible as the harder you brake the more current is sent to the HV battery and since batteries aren't perfect the faster you try to charge and discharge them the more energy gets wasted as heat instead of being stored and released usefully.
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what does WH stand for in cars?
Linear Mode
