| 1 |
Biological classification |
28,044 |
 |
| 2 |
Periodic table |
24,479 |
 |
| 3 |
Taxonomy |
6,709 |
 |
| 4 |
British undergraduate degree classification |
4,428 |
 |
| 5 |
Stellar classification |
3,545 |
 |
| 6 |
Motion picture rating system |
3,223 |
 |
| 7 |
Köppen climate classification |
2,971 |
 |
| 8 |
Vehicle Identification Number |
2,825 |
 |
| 9 |
Bloom's Taxonomy |
2,615 |
 |
| 10 |
Linnaean taxonomy |
1,360 |
 |
| 11 |
International Code of Botanical Nomenclature |
1,102 |
 |
| 12 |
Virus classification |
1,095 |
 |
| 13 |
Three-domain system |
1,011 |
 |
| 14 |
Fire classes |
985 |
 |
| 15 |
Aarne-Thompson classification system |
683 |
 |
| 16 |
Active galactic nucleus |
609 |
 |
| 17 |
Bordeaux Wine Official Classification of 1855 |
579 |
 |
| 18 |
Fach |
483 |
 |
| 19 |
Hornbostel-Sachs |
411 |
 |
| 20 |
Universal Decimal Classification |
340 |
 |
| 21 |
Viridiplantae |
339 |
 |
| 22 |
Memex |
301 |
 |
| 23 |
Sudarsky extrasolar planet classification |
300 |
 |
| 24 |
Carnegie Classification of Institutions of Higher Education |
261 |
 |
| 25 |
House numbering |
248 |
 |
| 26 |
Galaxy morphological classification |
245 |
 |
| 27 |
Multiple-alarm fire |
216 |
 |
| 28 |
AAR wheel arrangement |
205 |
 |
| 29 |
Structural Classification of Proteins |
197 |
 |
| 30 |
Baltimore classification |
196 |
 |
| 31 |
International Classification of Diseases for Oncology |
193 |
 |
| 32 |
Mathematics Subject Classification |
160 |
 |
| 33 |
Roget's Thesaurus |
158 |
 |
| 34 |
Hubble sequence |
133 |
 |
| 35 |
Colon classification |
126 |
 |
| 36 |
MedDRA |
118 |
 |
| 37 |
Climate classification |
108 |
 |
| 38 |
Systematized Nomenclature of Medicine |
107 |
 |
| 39 |
Joint Honours |
99 |
 |
| 40 |
Comparison of Dewey and Library of Congress subject classification |
97 |
 |
| 41 |
ACM Computing Classification System |
96 |
 |
| 42 |
Chinese Classification of Mental Disorders |
96 |
 |
| 43 |
Classification of Pharmaco-Therapeutic Referrals |
95 |
 |
| 44 |
Crime Classification Manual |
91 |
 |
| 45 |
Numerical taxonomy |
90 |
 |
| 46 |
Holdridge life zones |
84 |
 |
| 47 |
Class (locomotive) |
82 |
 |
| 48 |
Tuberculosis classification |
77 |
 |
| 49 |
CATH |
72 |
 |
| 50 |
Nippon Decimal Classification |
72 |
 |
| 51 |
Celestial Emporium of Benevolent Knowledge's Taxonomy |
72 |
 |
| 52 |
Historical Thesaurus of the Oxford English Dictionary |
70 |
 |
| 53 |
Mundaneum |
63 |
 |
| 54 |
World Reference Base for Soil Resources |
56 |
 |
| 55 |
Mini-international neuropsychiatric interview |
47 |
 |
| 56 |
PANOSE |
46 |
 |
| 57 |
Psychodynamic Diagnostic Manual |
46 |
 |
| 58 |
Chinese Library Classification |
46 |
 |
| 59 |
Structure of Observed Learning Outcome |
46 |
 |
| 60 |
Nihon Ethics of Video Association |
41 |
 |
| 61 |
Transporter Classification database |
38 |
 |
| 62 |
National Library of Medicine classification |
38 |
 |
| 63 |
UIC classification of goods wagons |
38 |
 |
| 64 |
Enriques–Kodaira classification |
37 |
 |
| 65 |
McGuire’s Motivations |
37 |
 |
| 66 |
Content rating |
36 |
 |
| 67 |
Military taxonomy |
32 |
 |
| 68 |
Peter F. Stevens |
28 |
 |
| 69 |
Eclass |
26 |
 |
| 70 |
Ranally city rating system |
24 |
 |
| 71 |
GMDN |
23 |
 |
| 72 |
Harvard–Yenching Classification |
21 |
 |
| 73 |
CIT Program Tumor Identity Cards |
19 |
 |
| 74 |
Korean Decimal Classification |
18 |
 |
| 75 |
Physics and Astronomy Classification Scheme |
17 |
 |
| 76 |
Classification schemes for indigenous languages of the Americas |
17 |
 |
| 77 |
Feighner Criteria |
16 |
 |
| 78 |
Classification of Instructional Programs |
15 |
 |
| 79 |
Standard Business Reporting |
15 |
 |
| 80 |
Brinkler classification |
13 |
 |
| 81 |
Schedule for Affective Disorders and Schizophrenia |
13 |
 |
| 82 |
World Health Organisation Composite International Diagnostic Interview |
13 |
 |
| 83 |
British Rail TOPS first arrangement |
11 |
 |
| 84 |
Shapley–Sawyer Concentration Class |
9 |
 |
| 85 |
Alisols |
9 |
 |
| 86 |
EUROP grid |
9 |
 |
| 87 |
China Time-honored Brand |
9 |
 |
| 88 |
Research Diagnostic Criteria |
7 |
 |
| 89 |
Groves classification system |
less than 5 views |
|
| 90 |
Fields of doctoral studies in the United States |
less than 5 views |
|
| 91 |
Ornithologists abbreviated names |
less than 5 views |
|