When you log in and are assigned a terminal device to type in (the terminal becomes standard input for your shell), you're made the owner of the device, and tty becomes the group owner.
Surface mounted piezoelectric devices for frequency control and selection - Standard Outlines and terminal lead connections - Part 1: plastic moulded enclosure Outlines.
频率控制和选则用表面安装的压电器件。标准外形和终端引线的连接。第1部分：塑料模压外壳外形。
3
Or, more formally, to use the -232c serial standard terms, between the Data Terminal Equipment (DTE) interface and the Data Communication Equipment (DCE) interface.