Why I?

In a few minutes of boredom in a switchroom today we discussed why 'I' is used for current. If you think of Ohms law V & R are pretty obvious but why 'I' for current? If we were discussing inductance I could understand it but that's measured in henrys. So, without cheating and Googling it anyone know the significance of the 'I'? No doubt it's obvious but we couldn't think of it.
Also why couldn't I post this without a prefix????? Had to pick hobby 😕

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