Unicode defines 220 blocks of related characters.

Blocks

Aegean Numbers
Alchemical Symbols
Alphabetic Presentation Forms
Ancient Greek Musical Notation
Ancient Greek Numbers
Ancient Symbols
Arabic
Arabic Extended-A
Arabic Mathematical Alphabetic Symbols
Arabic Presentation Forms-A
Arabic Presentation Forms-B
Arabic Supplement
Armenian
Arrows
Avestan
Balinese
Bamum
Bamum Supplement
Basic Latin
Batak
Bengali
Block Elements
Bopomofo
Bopomofo Extended
Box Drawing
Brahmi
Braille Patterns
Buginese
Buhid
Byzantine Musical Symbols
CJK Compatibility
CJK Compatibility Forms
CJK Compatibility Ideographs
CJK Compatibility Ideographs Supplement
CJK Radicals Supplement
CJK Strokes
CJK Symbols and Punctuation
CJK Unified Ideographs
CJK Unified Ideographs Extension A
CJK Unified Ideographs Extension B
CJK Unified Ideographs Extension C
CJK Unified Ideographs Extension D
Carian
Chakma
Cham
Cherokee
Combining Diacritical Marks
Combining Diacritical Marks Supplement
Combining Diacritical Marks for Symbols
Combining Half Marks
Common Indic Number Forms
Control Pictures
Coptic
Counting Rod Numerals
Cuneiform
Cuneiform Numbers and Punctuation
Currency Symbols
Cypriot Syllabary
Cyrillic
Cyrillic Extended-A
Cyrillic Extended-B
Cyrillic Supplement
Deseret
Devanagari
Devanagari Extended
Dingbats
Domino Tiles
Egyptian Hieroglyphs
Emoticons
Enclosed Alphanumeric Supplement
Enclosed Alphanumerics
Enclosed CJK Letters and Months
Enclosed Ideographic Supplement
Ethiopic
Ethiopic Extended
Ethiopic Extended-A
Ethiopic Supplement
General Punctuation
Geometric Shapes
Georgian
Georgian Supplement
Glagolitic
Gothic
Greek Extended
Greek and Coptic
Gujarati
Gurmukhi
Halfwidth and Fullwidth Forms
Hangul Compatibility Jamo
Hangul Jamo
Hangul Jamo Extended-A
Hangul Jamo Extended-B
Hangul Syllables
Hanunoo
Hebrew
High Private Use Surrogates
High Surrogates
Hiragana
IPA Extensions
Ideographic Description Characters
Imperial Aramaic
Inscriptional Pahlavi
Inscriptional Parthian
Javanese
Kaithi
Kana Supplement
Kanbun
Kangxi Radicals
Kannada
Katakana
Katakana Phonetic Extensions
Kayah Li
Kharoshthi
Khmer
Khmer Symbols
Lao
Latin Extended Additional
Latin Extended-A
Latin Extended-B
Latin Extended-C
Latin Extended-D
Latin-1 Supplement
Lepcha
Letterlike Symbols
Limbu
Linear B Ideograms
Linear B Syllabary
Lisu
Low Surrogates
Lycian
Lydian
Mahjong Tiles
Malayalam
Mandaic
Mathematical Alphanumeric Symbols
Mathematical Operators
Meetei Mayek
Meetei Mayek Extensions
Meroitic Cursive
Meroitic Hieroglyphs
Miao
Miscellaneous Mathematical Symbols-A
Miscellaneous Mathematical Symbols-B
Miscellaneous Symbols
Miscellaneous Symbols And Pictographs
Miscellaneous Symbols and Arrows
Miscellaneous Technical
Modifier Tone Letters
Mongolian
Musical Symbols
Myanmar
Myanmar Extended-A
NKo
New Tai Lue
Number Forms
Ogham
Ol Chiki
Old Italic
Old Persian
Old South Arabian
Old Turkic
Optical Character Recognition
Oriya
Osmanya
Phags-pa
Phaistos Disc
Phoenician
Phonetic Extensions
Phonetic Extensions Supplement
Playing Cards
Private Use Area
Rejang
Rumi Numeral Symbols
Runic
Samaritan
Saurashtra
Sharada
Shavian
Sinhala
Small Form Variants
Sora Sompeng
Spacing Modifier Letters
Specials
Sundanese
Sundanese Supplement
Superscripts and Subscripts
Supplemental Arrows-A
Supplemental Arrows-B
Supplemental Mathematical Operators
Supplemental Punctuation
Supplementary Private Use Area-A
Supplementary Private Use Area-B
Syloti Nagri
Syriac
Tagalog
Tagbanwa
Tags
Tai Le
Tai Tham
Tai Viet
Tai Xuan Jing Symbols
Takri
Tamil
Telugu
Thaana
Thai
Tibetan
Tifinagh
Transport And Map Symbols
Ugaritic
Unified Canadian Aboriginal Syllabics
Unified Canadian Aboriginal Syllabics Extended
Vai
Variation Selectors
Variation Selectors Supplement
Vedic Extensions
Vertical Forms
Yi Radicals
Yi Syllables
Yijing Hexagram Symbols