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### Grouping submenu

| underline | <CTL CMD U> |
| overline | <CTL CMD O> |
| underbrace | <CTL OPT CMD U> |
| overbrace | <CTL OPT CMD O> |
| overrightarrow |  |
| overleftarrow |  |
| stackrel |  |

The Grouping submenu has commands for underlining and overlining, and related commands that produce underbraces and overbraces. There's also a command called stackrel used to construct compound operators via vertical stacking (see p. 50 of the LaTeX book for more information).