In what context are all the extra Korean base sorting characters used?

Question

Wikipedia lists the sort order for South Korean words, as:

• Initial consonants: ᄀ, ᄁ, ᅚ, ᄂ, ᄓ, ᄔ, ᄕ, ᄖ, ᅛ, ᅜ, ᅝ, ᄃ, ᄗ, ᄄ, ᅞ, ꥠ, ꥡ, ꥢ, ꥣ, ᄅ, ꥤ, ꥥ, ᄘ, ꥦ, ꥧ, ᄙ, ꥨ, ꥩ, ꥪ, ꥫ, ꥬ, ꥭ, ꥮ, ᄚ, ᄛ, ᄆ, ꥯ, ꥰ, ᄜ, ꥱ, ᄝ, ᄇ, ᄞ, ᄟ, ᄠ, ᄈ, ᄡ, ᄢ, ᄣ, ᄤ, ᄥ, ᄦ, ꥲ, ᄧ, ᄨ, ꥳ, ᄩ, ᄪ, ꥴ, ᄫ, ᄬ, ᄉ, ᄭ, ᄮ, ᄯ, ᄰ, ᄱ, ᄲ, ᄳ, ᄊ, ꥵ, ᄴ, ᄵ, ᄶ, ᄷ, ᄸ, ᄹ, ᄺ, ᄻ, ᄼ, ᄽ, ᄾ, ᄿ, ᅀ, ᄋ, ᅁ, ᅂ, ꥶ, ᅃ, ᅄ, ᅅ, ᅆ, ᅇ, ᅈ, ᅉ, ᅊ, ᅋ, ꥷ, ᅌ, ᄌ, ᅍ, ᄍ, ꥸ, ᅎ, ᅏ, ᅐ, ᅑ, ᄎ, ᅒ, ᅓ, ᅔ, ᅕ, ᄏ, ᄐ, ꥹ, ᄑ, ᅖ, ꥺ, ᅗ, ᄒ, ꥻ, ᅘ, ᅙ, ꥼ, (filler; U+115F)
• Medial vowels: (filler; U+1160), ᅡ, ᅶ, ᅷ, ᆣ, ᅢ, ᅣ, ᅸ, ᅹ, ᆤ, ᅤ, ᅥ, ᅺ, ᅻ, ᅼ, ᅦ, ᅧ, ᆥ, ᅽ, ᅾ, ᅨ, ᅩ, ᅪ, ᅫ, ᆦ, ᆧ, ᅿ, ᆀ, ힰ, ᆁ, ᆂ, ힱ, ᆃ, ᅬ, ᅭ, ힲ, ힳ, ᆄ, ᆅ, ힴ, ᆆ, ᆇ, ᆈ, ᅮ, ᆉ, ᆊ, ᅯ, ᆋ, ᅰ, ힵ, ᆌ, ᆍ, ᅱ, ힶ, ᅲ, ᆎ, ힷ, ᆏ, ᆐ, ᆑ, ᆒ, ힸ, ᆓ, ᆔ, ᅳ, ힹ, ힺ, ힻ, ힼ, ᆕ, ᆖ, ᅴ, ᆗ, ᅵ, ᆘ, ᆙ, ힽ, ힾ, ힿ, ퟀ, ᆚ, ퟁ, ퟂ, ᆛ, ퟃ, ᆜ, ퟄ, ᆝ, ᆞ, ퟅ, ᆟ, ퟆ, ᆠ, ᆡ, ᆢ
• Final consonants: (none), ᆨ, ᆩ, ᇺ, ᇃ, ᇻ, ᆪ, ᇄ, ᇼ, ᇽ, ᇾ, ᆫ, ᇅ, ᇿ, ᇆ, ퟋ, ᇇ, ᇈ, ᆬ, ퟌ, ᇉ, ᆭ, ᆮ, ᇊ, ퟍ, ퟎ, ᇋ, ퟏ, ퟐ, ퟑ, ퟒ, ퟓ, ퟔ, ᆯ, ᆰ, ퟕ, ᇌ, ퟖ, ᇍ, ᇎ, ᇏ, ᇐ, ퟗ, ᆱ, ᇑ, ᇒ, ퟘ, ᆲ, ퟙ, ᇓ, ퟚ, ᇔ, ᇕ, ᆳ, ᇖ, ᇗ, ퟛ, ᇘ, ᆴ, ᆵ, ᆶ, ᇙ, ퟜ, ퟝ, ᆷ, ᇚ, ퟞ, ퟟ, ᇛ, ퟠ, ᇜ, ퟡ, ᇝ, ᇞ, ᇟ, ퟢ, ᇠ, ᇡ, ᇢ, ᆸ, ퟣ, ᇣ, ퟤ, ퟥ, ퟦ, ᆹ, ퟧ, ퟨ, ퟩ, ᇤ, ᇥ, ᇦ, ᆺ, ᇧ, ᇨ, ᇩ, ퟪ, ᇪ, ퟫ, ᆻ, ퟬ, ퟭ, ퟮ, ퟯ, ퟰ, ퟱ, ퟲ, ᇫ, ퟳ, ퟴ, ᆼ, ᇰ, ᇬ, ᇭ, ퟵ, ᇱ, ᇲ, ᇮ, ᇯ, ퟶ, ᆽ, ퟷ, ퟸ, ퟹ, ᆾ, ᆿ, ᇀ, ᇁ, ᇳ, ퟺ, ퟻ, ᇴ, ᇂ, ᇵ, ᇶ, ᇷ, ᇸ, ᇹ

First (tangential question), is the sort order initial consonants, followed by medial vowels, followed by final consonants Or are they intermingled somehow?

Main question is, what do all those "extra" symbols mean, compared to the ones listed here? In case the font is missing on your computer (I had to download a font to even see them), here is a screenshot of what I see on Wikipedia.

Looks like my font might be missing 2 or so even then, but still there's a lot of extra characters, what do they all mean, what is their use in addition to the "main" characters as linked?

Answer 1

Sort order of full characters (combined I-M-F) is "intermingled" in that characters are first sorted by I jamos, then use M to break ties in I's, then use F to break ties in I-M's. For example,

• ㄱ < ㄲ
• 가나 < 거기
• 각시 < 간
• 각시 < 그네 < 나그네

"Main" jamos are those used in the modern Standard Korean, extra ones are those found in old documents written before (both) modern Korea republics, and no longer used. They are called 옛한글 (Old Hangul) or 옛자모 (Old jamo). See also How important is Old Hangul in modern Korean culture?

Note that this sort order is lexicographical, and computationally it's only specified in the Korean Standard. Unicode is only partly aware of Hangul sorting order and the ICU, Unicode's reference implementation, will give you very different results when sorting Korean words that include Old Hangul jamos.

Answer 2

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1. Initial consonants come first, then medial vowels, then final consonants. The Unicode Hangul filler characters are just blanks for the position so that Hangul blocks can appear assembled without their components actually being present.

2. Those are mostly obsolete letters, that were used or referred to at some point in history.