| Substance | Abbreviation | Systematics | Provings |
| Jacaranda caroba Brazilian Caroba-tree |
Jac-c | Bignoniaceae |
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| Jade Jade |
Jade | Silikata monoklina |
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| Japanese Yen Japanese Yen |
JPY | Pecunia |
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| Jasminum multiflorum Downy jasmine |
Jasm-m | Oleaceae |
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| Jasminum officinale White Jessamine |
Jasm | Oleaceae |
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| Jaspis Jasper |
Lap-ia | Oxida trigonala |
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| Jatropha curcas Purging Nut |
Jatr | Euphorbiaceae |
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