Resistance ending with "r"

hello there !
cem 3340 diy simple
on this tutorial, they talk about resistor values that are ending with “r”
like 620r ? i don’t know what is that, and no one around me currently understands this…

I hope u can help me thank you !

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it’s for ohm, so 620R = 620 ohms

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but why ? can’t he just write "620 ohms " ?

it’s more short to write on schem or stripboard

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okay, thanks a lot !

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R is easier and takes up less space on schematics. It’s also easier than Ω which is the official symbol, but I need to switch to a Greek keyboard layout to type it.

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