| TTY   (Term Type in Source) | 
| AA | Attribute type abbreviation | 
| AB | Abbreviation in any source vocabulary | 
| ACR | Acronym | 
| AC | Activities | 
| AD | Adjective | 
| AS | Attribute type synonym | 
| AT | Attribute type | 
| BD | Fully-specified drug brand name that can be prescribed | 
| BN | Fully-specified drug brand name that can not be prescribed | 
| BSY | Broad synonym | 
| BioCPT | BioCarta PT | 
| CCN | Chemical code name | 
| CCS | FIPS 10-4 country code | 
| CC | Trimmed ICPC component process | 
| CDA | Clinical drug name in abbreviated format | 
| CDCPT | Centers for Disease Control and Prevention PT | 
| CDC | Clinical drug name in concatenated format (NDDF), Clinical drug name (NDFRT) | 
| CDD | Clinical drug name in delimited format | 
| CDISCPT | Clinical Data Interchange Standards Consortium PT | 
| CDISCSY | Clinical Data Interchange Standards Consortium SY | 
| CD | Clinical Drug | 
| CE | Entry "term" to a Supplementary Concept "term" | 
| CHN | Chemical structure name | 
| CL | Class | 
| CMN | Common name | 
| CN | LOINC official component name | 
| CO | Component name (these are hierarchical terms, as opposed to the LOINC component names which are analytes) | 
| CP | ICPC component process (in original form) | 
| CSN | Chemical Structure Name | 
| CS | Short component process in ICPC, i.e. include some abbreviations | 
| CU | Common usage | 
| CV | Content view | 
| CX | Component process in ICPC with abbreviations expanded | 
| DCPPT | Division of Cancer Prevention Program PT | 
| DEV | Descriptor entry version | 
| DE | Descriptor | 
| DF | Dose Form | 
| DI | Disease name | 
| DN | Display Name | 
| DO | Domain | 
| DP | Drug Product | 
| DSV | Descriptor sort version | 
| DS | Short form of descriptor | 
| DTPSY | Developmental Therapeutics Program SY | 
| DX | Diagnosis | 
| EN | MeSH nonprint entry "term" | 
| EP | Entry "term" | 
| EQ | Equivalent name | 
| ES | Short form of entry term | 
| ETAV | Entry Term Allelic Variant | 
| ET | Entry "term" | 
| EX | Expanded form of entry term | 
| FBD | Foreign brand name | 
| FDAAB | Food and Drug Administration AB | 
| FDAPT | Food and Drug Administration PT | 
| FDASY | Food and Drug Administration SY | 
| FI | Finding name | 
| FN | Full form of descriptor | 
| GN | Generic drug name | 
| GO | Goal | 
| GT | Glossary "term" | 
| HC | Hierarchical class | 
| HD | Hierarchical descriptor | 
| HGJKN1 | Japanese High Level Group Term (kana1) | 
| HGJKN | Japanese High Level Group Term (kana) | 
| HG | High Level Group Term | 
| HS | Short or alternate version of hierarchical term | 
| HTJKN1 | Japanese Hierarchical term (kana1) | 
| HTJKN | Japanese Hierarchical term (kana) | 
| HTN | HL7 Table Name | 
| HT | Hierarchical term | 
| HX | Expanded version of short hierarchical term | 
| ID | Nursing indicator | 
| INP | Ingredient preparation | 
| IN | Name for an ingredient | 
| IS | Obsolete Synonym | 
| IT | Index "term", i.e., derived from the index to any non-MeSH source vocabulary | 
| IV | Intervention | 
| JAXPT | NCI Mouse Terminology PT | 
| JAXSY | NCI Mouse Terminology SY | 
| KEGGPT | Kyoto Encyclopedia of Genes and Genomes PT | 
| LN | LOINC official fully specified name | 
| LO | Obsolete official fully specified name | 
| LPDN | LOINC parts display name | 
| LPN | LOINC parts name | 
| LS | Expanded system/sample type (The expanded version was created for the Metathesaurus and includes the full name of some abbreviations.) | 
| LTJKN1 | Japanese Lower Level Term (kana1) | 
| LTJKN | Japanese Lower Level Term (kana) | 
| LT | Lower Level Term | 
| LV | Lexical variant | 
| LX | Official fully specified name with expanded abbreviations | 
| MD | CCS multi-level diagnosis categories | 
| MH | Main heading | 
| MOA | Mechanism of action | 
| MP | Preferred names of modifiers | 
| MS | Multum names of branded and generic supplies or supplements | 
| MTH_AB | MTH abbreviation | 
| MTH_ACR | MTH acronym | 
| MTH_BD | MTH fully-specified drug brand name that can be prescribed | 
| MTH_BSY | Metathesaurus broad synonym expanded | 
| MTH_CHN | MTH chemical structure name | 
| MTH_EP | MTH entry "term" | 
| MTH_FN | MTH Full form of descriptor | 
| MTH_HG | MTH High Level Group Term | 
| MTH_HT | MTH Hierarchical term | 
| MTH_ID | Metathesaurus expanded form of nursing indicator | 
| MTH_IS | Metathesaurus-supplied form of obsolete synonym | 
| MTH_LT | MTH Lower Level Term | 
| MTH_LV | MTH lexical variant | 
| MTH_MH | MTH main heading | 
| MTH_NPT | MTH non-preferred for language term | 
| MTH_NSY | Metathesaurus narrow synonym expanded | 
| MTH_OF | Metathesaurus-supplied form of obsolete fully specified name | 
| MTH_OL | MTH Non-current Lower Level Term | 
| MTH_OPN | Metathesaurus obsolete preferred term, natural language form | 
| MTH_OP | Metathesaurus obsolete preferred term | 
| MTH_OS | MTH System-organ class | 
| MTH_PTGB | Metathesaurus-supplied form of British preferred term | 
| MTH_PTN | Metathesaurus preferred term, natural language form | 
| MTH_PT | Metathesaurus preferred term | 
| MTH_RLS | Metathesaurus related synonym expanded | 
| MTH_SMQ | Metathesaurus version of Standardised MedDRA Query | 
| MTH_SYGB | Metathesaurus-supplied form of British synonym | 
| MTH_SY | MTH Designated synonym | 
| MT | An alternate form of a concept name from one of the source vocabularies created for the Metathesaurus | 
| MV | Multi-level procedure category | 
| N1 | Chemical Abstracts Service Type 1 name of a chemical | 
| NCI-GLOSSPT | NCI-GLOSS PT | 
| NCI-GLOSSSY | NCI-GLOSS SY | 
| NM | Supplementary chemical "term", a name of a substance | 
| NPT | HL7 non-preferred for language term | 
| NP | Non-preferred term | 
| NSY | Narrow synonym | 
| NS | Short form of non-preferred term | 
| NX | Expanded form of non-preferred term | 
| OA | Obsolete abbreviation | 
| OBS | Obsolete broad synonym | 
| OB | Obsolete term | 
| OCD | Obsolete clinical drug | 
| OC | Nursing outcomes | 
| OF | Obsolete fully specified name | 
| OLJKN1 | Japanese Non-current Lower Level Term (kana1) | 
| OLJKN | Japanese Non-current Lower Level Term (kana) | 
| OLX | Expanded LOINC obsolete fully specified name | 
| OL | Non-current Lower Level Term | 
| OM | Obsolete modifiers in HCPCS | 
| ONP | Obsolete non-preferred for language term | 
| ONS | Obsolete narrow synonym | 
| OOSN | Obsolete official short name | 
| OPN | Obsolete preferred term, natural language form | 
| OP | Obsolete preferred term | 
| ORS | Obsolete related synonym | 
| OR | Orders | 
| OSJKN1 | Japanese System-organ class in the WHO Adverse Reaction Terminology (kana1) | 
| OSJKN | Japanese System-organ class in the WHO Adverse Reaction Terminology (kana) | 
| OSN | Official short name | 
| OS | System-organ class in the WHO Adverse Reaction Terminology | 
| PCE | Preferred entry "term" to a Supplementary Concept "term" | 
| PC | Preferred "trimmed term" in ICPC | 
| PEN | Preferred MeSH nonprint entry "term" | 
| PEP | Preferred entry "term" | 
| PE | Physiologic effect | 
| PK | Pharmacokinetics | 
| PM | Machine permutation | 
| PN | Metathesaurus preferred name | 
| PQ | Qualifier for a problem | 
| PR | Name of a problem | 
| PSC | Protocol selection criteria | 
| PS | Short forms that needed full specification | 
| PTAV | Preferred Allelic Variant | 
| PTCS | Preferred Clinical Synopsis | 
| PTGB | British preferred term | 
| PTJKN1 | Japanese Designated preferred name (kana1) | 
| PTJKN | Japanese Designated preferred name (kana) | 
| PTN | Preferred term, natural language form | 
| PT | Designated preferred name | 
| PXQ | Preferred term in preferred qualifier concept. | 
| PX | Expanded preferred terms (pair with PS) | 
| QAB | Qualifier abbreviation | 
| QEV | Qualifier entry version | 
| QSV | Qualifier sort version | 
| RAB | Root abbreviation | 
| RHT | Root hierarchical term | 
| RLS | Related synonym | 
| RPT | Root preferred term | 
| RSY | Root synonym | 
| RS | Extracted related names in SNOMED2 | 
| RT | Designated related "term" | 
| SBDC | Semantic Branded Drug Component | 
| SBDF | Semantic branded drug and form | 
| SBD | Semantic branded drug | 
| SB | Named subset of a source | 
| SCDC | Semantic Drug Component | 
| SCDF | Semantic clinical drug and form | 
| SCD | Semantic Clinical Drug | 
| SCN | Scientific name | 
| SC | Special Category term | 
| SD | CCS single-level diagnosis categories | 
| SI | Name of a sign or symptom of a problem | 
| SMQ | Standardised MedDRA Query | 
| SN | Official component synonym in LOINC | 
| SP | CCS single-level procedure categories | 
| SSN | Source short name, used in the UMLS Knowledge Source Server | 
| SS | Synonymous "short" forms | 
| ST | Step | 
| SU | Active Substance | 
| SX | Mixed-case component synonym with expanded abbreviations | 
| SYGB | British synonym | 
| SYN | Designated alias | 
| SY | Designated synonym | 
| TA | Task | 
| TC | Term class | 
| TG | Name of the target of an intervention | 
| TQ | Topical qualifier | 
| TX | CCPSS synthesized problems for TC termgroup | 
| UCN | Unique common name | 
| UE | Unique equivalent name | 
| USN | Unique scientific name | 
| USY | Unique synonym | 
| VAB | Versioned abbreviation | 
| VPT | Versioned preferred term | 
| VSY | Versioned synonym | 
| XD | Expanded descriptor in AOD | 
| XM | Cross mapping set | 
| XQ | Alternate name for a qualifier | 
| XX | Expanded string |