The word (also used as a prefix or suffix) bis , applied to some modem protocol standards, is Old Latin for "repeat" (akin to Old High German "twice"). When a protocol ends with "bis," it means that it's the second version of that protocol.
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Similarly, ter is from Old Latin meaning "three times." The suffix terbo in the V.xx modem protocol is an invented word based on the Old Latin ter and the word turbo (Latin for "whirling top" or "whirlwind") meaning "speed." V.32terbo is the third version developed of the V.32 modem protocol..