Arduino Uno Manual page 6

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3 x 6 Header (White/Red/Black)
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A0 / 5V / Ground
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A1 / 5V / Ground
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A2 / 5V / Ground
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A3 / 5V / Ground
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A4 / 5V / Ground
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A5 / 5V / Ground
There is also a 3-pin blue header that that brings out 5V, ground and D2 that can be used for a digital sensor
or other remote connection
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1 x 3 Header (Blue)
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G = Ground
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'+' = 5V
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S = D2 – digital I/O
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RGB LED
And for good measure, there is a 5-pin header that brings out D3, D5, D6, 5V and Ground. This puts 3
PWM outputs along with power and ground on a single connector which can be handy for several things
like driving an RGB LED.
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1 x 5 Header (Blue)
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' ' = 5V – This pin is unmarked but sits next to D7
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B = D6 – B could be used for Blue on RGB LED
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G = D5 – G could be used for Green on RGB LED
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'-' = Ground