t=

There is another page with same name:

次元 t (URL)

t= (SDP)

[9] RFC 2327: SDP: Session Description Protocol, 12/2/2023, 11:54:22 AM, 12/2/2023, 12:20:04 PM https://www.rfc-editor.org/rfc/rfc2327
[10] RFC Errata Report » RFC Editor, 12/2/2023, 12:21:18 PM https://www.rfc-editor.org/errata/rfc2327

[1] RFC 4566: SDP: Session Description Protocol, 12/2/2023, 7:30:22 AM, 12/2/2023, 11:59:40 AM https://www.rfc-editor.org/rfc/rfc4566.html#section-5.9
[3] RFC Errata Report » RFC Editor, 12/2/2023, 12:15:36 PM https://www.rfc-editor.org/errata/rfc4566

Google search: t=