:high bit: [from `high-order bit'] n. 1. The most significant
bit in a byte. 2. By extension, the most significant part of
something other than a data byte: "Spare me the whole {saga},
just give me the high bit." See also {meta bit}, {hobbit},
{dread high-bit disease}, and compare the mainstream slang
`bottom line'.
-- The AI Hackers Dictionary