nanoエディタ　配色の色コードが知りたい。

nanoテキストエディタですが提示コードは設定ファイルのテキストファイルなのですがカラーコードの意味が知りたいです。これはどんなカラーコードなのでしょうか？HTMLのカラーコードではないようなのですがどういった名称のものなのでしょうか？公式ドキュメントを見ましたがわかりません。

公式ドキュメント：　https://www.nano-editor.org/docs.php

nanorc
1## Here is an example for C/C++.
2 2
3 3 syntax c ".([ch](pp|xx)?|C|cc|c++|cu|H|hh|ii?)$"
4 4 header "-*-.*\<C(++)?((;|\s).*)?-*-"
5 5 magic "^(C|C++) (source|program)"
6 6 comment "//"
7 7
8 8 # Constants.
9 9 color brightred "\<[A-Z_][0-9A-Z_]+\>"
1010 # Labels.
1111 color brightmagenta "^[[:space:]]*[A-Z_a-z]+:[[:space:]]*$"
1212
1313 color brightblue "\<(float|double|bool|char|int|short|long|sizeof|enum|void|auto|static|const|struct|union|typedef|extern|(un)?sign>
1414 color brightblue "\<([[:lower:]][[:lower:]_]*|(u_?)?int(8|16|32|64))_t\>"
1515 color brightblue "\<(class|namespace|template|public|protected|private|typename|this|friend|virtual|override|using|mutable|volatile>
1616 color brightyellow "\<(for|if|while|do|else|case|default|switch)\>"
1717 color brightyellow "\<(try|throw|catch|operator|new|delete)\>"
1818 color magenta "\<(goto|continue|break|return)\>"
1919 color brightmagenta "'([^']|(\["'abfnrtv\]))'" "'\(([0-3]?[0-7]{1,2}))'" "'\x[0-9A-Fa-f]{1,2}'"
2020
2121 # GCC builtins.
2222 color cyan "__attribute__[[:space:]]*(([^)]*))" "__(aligned|asm|builtin|hidden|inline|packed|restrict|section|typeof|weak)__"
2323
2424 # Strings.  In general you will want your strings and comments to come last,
2525 # because highlighting rules are applied in the order they are read in.
2626 color brightyellow ""([^"]|\")*"" "#[[:space:]]*include[[:space:]]+<[^[:blank:]=]*>"
2727 # Multiline strings.  This regex is VERY resource intensive,
2828 # and sometimes colours things that shouldn't be coloured.
2929 ###color brightyellow start=""(\.|[^"])*\[[:space:]]*$" end="^(\.|[^"])*""
3030
3131 # Preprocessor directives.
3232 color brightcyan start="^[[:space:]]*#[[:space:]]*(if(n?def)?|elif|warning|error|pragma)\>" end="(\`|[^\])$"
3333 color brightcyan "^[[:space:]]*#[[:space:]]*(define|else|endif|include(_next)?|undef)\>"
3434
3535 # Comments.
3636 color green "//.*"
3737 #color brightblue "//.*"
3838
3939 color green start="/*" end="*/"
4040
4141 # Reminders.
42