What category does the help page for AnsiEsc belong to?

Hi,

`:help` shows the following categories of help topics. But what does
AnsiEsc belong to?

WHAT PREPEND EXAMPLE
Normal mode command (nothing) :help x
Visual mode command v_ :help v_u
Insert mode command i_ :help i_<Esc>
Command-line command : :help :quit
Command-line editing c_ :help c_<Del>
Vim command argument - :help -r
Option ' :help 'textwidth'

--
Regards,
Peng

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