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The diacritics and punctuation of scripts other than Latin, plus the invisible characters that control how text is joined and rendered. What holds the group together is that each carries information the shape does not: a shadda changes which word is written, a Thai tone mark produces different tones on different consonants, a Tibetan dot separates syllables in a script with no word spaces, a zero-width joiner is invisible and is what makes a family emoji one picture. Several members exist to record a mark that preserves something already lost — an iota subscript for a sound that had stopped being pronounced, a Thai silencing mark for a consonant kept only in spelling.
A small w-shaped mark above a letter, doubling it.
A small circle above a letter, marking no vowel.
A horizontal stroke stretching a joined letter.
An ornate circular mark containing a verse number.
A dot inside a Hebrew letter.
Small marks above and below the text, giving melody and syntax.
A short slanting stroke beneath a consonant.
A dot above a letter, marking a nasal.
A single vertical stroke ending a sentence.
A small vertical stroke above a Thai consonant.
A small mark above a letter, silencing it.
A small raised dot separating syllables.
An ornate head mark opening a Tibetan text.
Two short strokes at a kana's upper right.
A mark repeating the preceding character.
A short teardrop stroke used only between list items.
An underline beneath a personal or place name.
A small iota written beneath a vowel.
Right-angle brackets used as quotation marks in East Asia.
An invisible character forcing two characters to join.
An invisible character at the head of a file, declaring encoding.
A black diamond containing a white question mark.
An invisible character choosing between glyph forms.