9:3 · A sign used in seventeenth century chemistry for crucible, i.e. a pot in which for instance metals were melted. Crucible was also drawn and .
    This sign is also known as the crutch cross, the Jerusalem cross, or the cross of the Holy Cross. For more details, turn to in Group 28.
    This sign was also used for acids in alchemy and old chemistry. Hydrochloric acid, for example, could be written , where signified salt.

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