| 5A | 5a | 5A (disambiguation) |
| 5A (drum stick) | 5A (Long Island bus) | 5A Molecular Sieve |
| 5a reductase inhibitor | 5A reductase inhibitor | 5A Reductase inhibitor |
| 5a Reductase inhibitor | 5A scenic area | 5A-2500 |
| 5a-androst-2-ene-17-one | 5a-DHT | 5a-Dihydroprogesterone |
| 5a-Dihydrotestosterone | 5a-hydroxysteroid dehydratase | 5A-ONG |
| 5a-reductase | 5A-Reductase | 5a-reductase inhibitor |
| 5a-Reductase inhibitor | 5A-Reductase inhibitor | 5A22 |
| 5A8 | 5AA | 5ABCFM |
| 5ABCRN | 5ABCRR | 5ACR |
| 5Action | 5AD | 5AD (radio station) |
| 5ADD | 5ADL | 5AF |
| 5AL | 5alpha reductase inhibitor | 5alpha Reductase inhibitor |
| 5alpha-cholest-7-en-3beta-ol,NAD(P)H:oxygen 5-oxidoreductase | 5alpha-dihydrotestosterone | 5alpha-ergosta-7,22-diene-3beta,5-diol 5,6-hydro-lyase (ergosterol-forming) |
| 5alpha-hydroxysteroid dehydratase | 5alpha-pregnan-3,20-dione:NADP+ 5-oxidoreductase | 5alpha-reductase inhibitor |
| 5alpha-Reductase inhibitor | 5AM | 5am |
| 5am (album) | 5AM (M Huncho song) | 5am (Milet album) |
| 5AM in Toronto | 5AMLD | 5AN |
| 5Angels | 5angels | 5AR |
| 5AR-FE | 5ARD | 5aReductase |
| 5ARI | 5ASA | 5AT Advanced Technology Steam Locomotive |
| 5AT project | 5AU | 5Av |
| 5‒1‒1 | 5–10–15 Hours | 5–12 Alexander Square |
| 5–2 defense | 5–2–4 defense | 5–3 defense |
| 5–4–3–2–1 | 5–7 Broad Street (Boston) | 5–7 Cathedral Street, Dunkeld |
| 5–8 club | 5’ end | 5’UTR |
| 5′ | 5′ cap | 5′ Cap |
| 5′ end | 5′ flanking region | 5′ untranslated region |
| 5′ UTR | 5′,5″-dibromo-o-cresolsulfophthalein | 5′,5″-Dibromo-o-cresolsulfophthalein |
| 5′-end | 5′-Methylthioadenosine | 5′-Phosphoribosyl-4-carboxy-5-aminoimidazole |
| 5′-phosphoribosyl-4-carboxy-5-aminoimidazole | 5′-Phosphoribosyl-5-aminoimidazole | 5′-Phosphoribosylformylglycinamidine |
| 5′-phosphoribosylformylglycinamidine | 5″/40 caliber gun | 5₁ knot |
| 5₂ knot | 5€ | 5₱ |
| 5₹ | 5₹ (Indian coin) | 5→9 From Five to Nine |
| 5→9〜私に恋したお坊さん〜 | 5∙24 measure | 5¢ |
| 5ª Geração | 5° ASA | 5° DIN |
| 5° Sch. | 5·12 Wenchuan Earthquake Memorial Museum | 5·16 Coup d'état |
| 5·18 Gwang-ju Democratization Movement | 5·18 Gwangju Democratization Movement | 5¼ inch |
| 5¼ inch floppy | 5¼ inch floppy disk | 5¼" |
| 5¼" floppy | 5¼" floppy disk | 5¼" floppy drive |
| 5¼-inch disk | 5¼in | 5¼in floppy |
| 5¼in floppy disk | 5½ | 5½ Minute Hallway |
| 5×20 All the Best!! 1999-2019 | 5×20 All the Best!! 1999–2019 | 5×5=25 |
| 5×5×5 | 5àsec | 5ème arrondissement |
| 5ème arrondissement, Paris | 5ème Régiment de Dragons | 5B |
| 5b | 5B (disambiguation) | 5B (film) |
| 5B-DBY | 5b-Dihydroprogesterone | 5B2 |
| 5B3 | 5b4es | 5BBB |
| 5bbt | 5BC | 5BEL |
| 5beta-cholestan-3-one:NADP+ 4,5-oxidoreductase | 5beta-cholestane-3alpha,7alpha,12alpha-triol,NADPH:oxygen oxidoreductase (26-hydroxylating) | 5beta-cholestane-3alpha,7alpha-diol 12alpha-hydroxylase |
| 5beta-cholestane-3alpha,7alpha-diol,NADPH:oxygen oxidoreductase (12alpha-hydroxylating) | 5beta-Reductase | 5Beta-Scymnol |
| 5bp | 5bp. | 5BX |
| 5BX Plan | 5c | 5C |
| 5C (disambiguation) | 5C people | 5CB |
| 5ch | 5chan | 5channel |
| 5CK | 5CL | 5cm |
| 5cm (disambiguation) | 5cm flak 41 | 5cm per Second |
| 5cm/s | 5cream | 5Cs |
| 5CSRTT | 5CST | 5D |
| 5d | 5D (disambiguation) | 5D (Fifth Dimension) |
| 5D (Lykke Li song) | 5d (New York City Subway service) | 5D (song) |
| 5D BIM | 5D CAD | 5D Chess with Multiverse Time Travel |
| 5D Chess With Multiverse Time Travel | 5D episodes | 5D Full Disclosure |
| 5D Mark 2 | 5D Mark 3 | 5D Mark 4 |
| 5D Mark ii | 5D Mark II | 5D Mark III |
| 5D Mark IV | 5D Mk 3 | 5D Mk III |
| 5D MKII | 5D modeling | 5D optical data storage |
| 5d space | 5D's | 5d's |
| 5D's episodes | 5D's Yu-Gi-Oh! | 5D/Brorsen |
| 5D2 | 5D3 | 5DDD |
| 5DDN | 5DIII | 5DIV |
| 5dm | 5DMKIII | 5DN |
| 5doll | 5dolls | 5Dolls |
| 5DR | 5DS | 5DX |
| 5E | 5e | 5E (disambiguation) |
| 5e arrondissement | 5e Bataillon des services | 5e division blindée |
| 5e Groupe Brigade Mécanisé du Canada | 5e Groupe Brigade Mecanise du Canada | 5e Groupe-brigade mecanisé du Canada |
| 5e Groupe-brigade mecanise du Canada | 5E instructional model | 5e Régiment d'artillerie légère du Canada |
| 5e Régiment d'Hélicoptères de Combat | 5e Régiment d’Artillerie Légère du Canada | 5e Régiment de Dragons |
| 5e régiment de dragons | 5e régiment de hussards | 5e Régiment de Hussards (1815) |
| 5e RIAOM | 5EBI | 5ecret 5tar 5ystem |
| 5eme arrondissement | 5eme arrondissement, Paris | 5ep |
| 5ep (album) | 5EPs | 5ESS |
| 5ess switch | 5ESS Switch | 5ESS switch |
| 5ESS Switching System | 5EZY | 5F |
| 5f | 5F (disambiguation) | 5F (music) |
| 5F-AB-FUPPYCA | 5F-AB-PINACA | 5F-ADB |
| 5F-ADB-PICA | 5F-ADB-PINACA | 5F-ADBICA |
| 5F-AEB | 5F-AET | 5F-AKB48 |
| 5F-AMB | 5F-AMB-PICA | 5F-AMB-PINACA |
| 5F-AMT | 5F-APICA | 5F-APINACA |
| 5F-APP-PICA | 5F-APP-PINACA | 5F-CUMYL-P7AICA |
| 5F-CUMYL-PEGACLONE | 5F-CUMYL-PINACA | 5F-DET |
| 5F-DMT | 5F-EDMB-PINACA | 5F-EMB-PINACA |
| 5F-EPT | 5F-JWH-398 | 5F-MDMB-2201 |
| 5F-MDMB-PICA | 5F-MDMB-PINACA | 5F-MET |
| 5F-MMB-PICA | 5F-MMB-PINACA | 5F-MN-21 |
| 5F-MN-24 | 5F-MPMI | 5F-NE-PIMO |
| 5F-NE-PINAMO | 5F-NNE1 | 5F-NNEI |
| 5F-PB-22 | 5F-PB22 | 5F-PCN |
