| 50 | Harley-Davidson Tin Upsilon Andromedae |
|---|
| 500 | Independent school (UK) |
|---|
| 5000 | Tao Te Ching |
|---|
| 50001 | Asteroid |
|---|
| 500x | Boeing 747 |
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| 51 | Antimony Floppy disk Space Shuttle Challenger disaster |
|---|
| 5¼ | Floppy disk |
|---|
| 52 | Playing card Tellurium |
|---|
| 53 | Iodine |
|---|
| 530 | Gliese 876 |
|---|
| 535 | Andromeda Galaxy |
|---|
| 54 | AK-47 Xenon |
|---|
| 55 | 55 Cancri 55 Cancri c 55 Cancri e Caesium |
|---|
| 551 | Proxima Centauri |
|---|
| 5546 | Gliese 876 |
|---|
| 56 | Andromeda Galaxy Barium Crimean War |
|---|
| 57 | Lanthanum |
|---|
| 58 | Cerium T-34 |
|---|
| 59 | Praseodymium |
|---|
| 5h2o | Copper(II) sulfate |
|---|
| 5th | 5th century James Monroe Jupiter |
|---|
| 5v | Volt |
|---|