octet
八位组（octet） 在网络中，经常使用octet这个词（而不是byte）。因为一些机器的结构使用的字节长度不是8位。
以下常见词语中包含这个单词
Universal Multiple-Octet Coded Character Set (UCS)
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Octet is a string that represents an array of bytes. This syntax is used to store binary data.
for example:
Each IP address is 32 bits long and composed of four octets, or 8-bit fields. An octet is a decimal number in the range from 0 through 255. Each octet is separated by a period.