A brand name appearing on various Chinese handhelds. First appeared (I think) as simply part of the model number designation of otherwise unbranded consoles - eg BL-xxx - but they now have a trademarked logo (seen, for example, on the packaging of the BL-826A), so I'd say I can consider it a "brand" now.
What I don't know is who owns the brand; I've been unable to find any Chinese trademark records for the "BL" logo, but it's such a common pair of letters that it's really quite hard to search effectively. It may be connected to Wellminds, who have at least been involved with the development and sale of their consoles.
Some 1688.com listings have it standing for "宝龙" or "Baolong".