A type of glove.
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Here's a review from a US cycling mag.
"When the temperature dips, lobster gloves are your best bet for keeping your hands warm while retaining some freedom of movementāthey trap more heat than gloves and afford more dexterity than mittens. The Siberian Split Finger from Craft is warm, comfy, and competitively priced. The glove separates your fingers into a sort of Vulcan greeting, and within those two compartments thereās a small separator between the two fingers that helps wick sweat. The inside of the glove is plush and cozy, and the cuff hugs the wrist closely with a Velcro closure. Thereās a soft wipe on the side of the thumb for a cold-weather runny nose, and fully reflective fabric on the top for gloomy days and nighttime rides."
Mine were a cheap pair from Aldi's but I still find them warmer than traditional gloves. Clumsier than gloves but fine once you get used to them.