noun
start bit
In serial data transmission, the bit that signals the beginning of a character or data frame.
シリアル通信では、開始ビットの後にデータビットが続く。
In serial communication, data bits follow the start bit.
The stop bit marks the end of a data frame, while the start bit marks the beginning.
Compound of 開始 (start) and ビット (bit), a direct translation of the English computing term.