In marbles, any marble, but esp. a 5/8" regulation-sized target marble. Also a target in a marble game.
Knoppix-MiB is a version of the Knoppixlinux distribution which focuses on security issues.
Mint In Box, a collector's abbreviation for an item in mint condition
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Witnesses who report MIB sightings often describe "foreign looking" men with exotic features; it's as if they're "from elsewhere." They look "Oriental" or "Indian" and have "deeply tanned" skin, although sometimes their complexions are extremely pale.
Another MIB is initially perplexed when shown the strange terrestrial implement we know as the ballpoint pen, but then becomes gleefully spastic as he absconds into the street with the prize.
MIBs frequently speak tortured English with outlandish accents; in some accounts they don't move their lips when they communicate, suggesting a knack for telepathy, while in other encounters they speak like "machines." When it comes to the MIB, the subtext is always "We're not from around here."