| 1L | 1LT | 1LtCol | 1:M | 1M4JC |
| 1Malaysia Development Berhad | 1MB | 1MC | 1-MCP | 1MDB |
| 1-Mesitylene-Sulfonyl-3-Nitrotriazole | 1-Methoxy-2-Propanol | 1-methyl-4-phenyl-4-propionoxypiperidine | 1-(Methylamino)-2,3-Propanediol | 1-MHT |
| 1MR | 1N | 1NC | 1NCD | 1ND |
| 1 NE | 1NF | 1-Nitropyrene | 1NN | 1NWGA |
| 1O2 | 1OO2 | 1-OZD | 1P | 1-Palmitoyl-2-(16-(S-Methyldithio)-Hexadecanoyl)-Sn-Glycero-3-Phosphocholine |
| 1-Pyrenyldiazomethane | 1-RM | 1SG | 1SGT | 1SR |
| 1ST | 1STA | 1ST C OF MT | 1ST C OF T | 1-Stearoyl-2-Oleoyl-Sn-Glycero-3-Phosphatidylcholine |
| 1ST MUS | 1STSGT | 1T | 1TBS | 1TR6 |
| 1-U | 1U | 1UP | 1V | 1V1 |
| 1V1V | 1Voice 1Vision Ltd. | 1VP | 1W | 1WA |
| 1WO | 1X | 1X2 | 1XEV-DO | 1XEV-DV |
| 1x Evolution-Data and Voice | 1x Evolution-Data Only | 1xRTT | 1Z | 2 |
| 20 | 200 | 20,000 Cornish Men Will Know The Reason Why | 2003 Medicare Prescription Drug Act | 200Q20V |
| 201 | 2010 BIP | 2010BIP | 201TL | 202 |
| 203 | 204 | 205 | 206 | 207 |
| 20A | 20Q | 20th century Software Preservation Archive | 21 | 211 |
| 21A | 21CA | 21CC | 21CCLC | 21 CLW |
| 21CLW | 21CLWTD | 21CLW(TLD) | 21MC | 21st Century African Youth Movement |
| 21st Century Nanotechnology Research and Development Act of 2003 | 21st Century Tactical Command and Control Study | 2/2 | 2,2,2-Trifluoroethanol | 2,3,7,8-Tetrachlorodibenzo-p-Dioxin |
| 2,3-Butanedione Monoxime | 2,3-Dimethyl-2, 3-Dinitrobutane | 2-(3-indolyl)-Ethyl Phenyl Ketone | 2-4-5-6 Tetrachlorometaxylene | 2,4,6-Trichloroanisol |
| 2,4-Dienoyl-COA Reductase | 2,4-Dinitrophenylhydrazine | 2,5-dideoxy-2,5-imino-d-mannitol | 2,5-Dimethy-Dicyanoquinonediimine | 2,5-Furandicarboxylic Acid |
| 2'-5' oligoadenylate synthetase | #25P | #25 Pikachu | 2,6-Dichlorophenol Indophenol | 2,6-Di-Tert-Butyl-P-Cresol |
| 2A | 2-AAF | 2-ACB | 2-Acetamidofluorene | 2-acrylamido-2-methyl-1-propanesulfonate |
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