[FIG(quote)[
[FIGCAPTION[
[1] [CITE@en[RFC 959 - File Transfer Protocol]]
( ([TIME[2016-06-05 16:18:06 +09:00]]))
<https://tools.ietf.org/html/rfc959#page-5>
]FIGCAPTION]

> 
>       NVT
>          The Network Virtual Terminal as defined in the Telnet Protocol.

]FIG]