identifier
Click on the red underlined text to get to the source
... IETF will
preserve trademark and service mark identifiers used by the
Contributor of the Contribution, including (TM) and (R) where
...
... IETF will preserve trademark and service
mark identifiers used by the Contributor of the RFC Editor
Contribution, including (TM) and (R) where appropriate.
...
... MIB", substitute "MIB module"
with an appropriate identifier. In the case of MIB and PIB
modules this statement should be placed in the DESCRIPTION clause
...