1

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The image above is a functional chord symbol. But what does the number mean?

3

This means a minor "one" chord (triad) in first inversion. The 6 is short for 6-3 (both superscripted, with the 6 above the three), meaning that the chord is arranged with a sixth and a third above the lowest pitch.

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1

Lower-case 'i' means the tonic chord of a minor key. The superscript '6' means first inversion. Intervals of a 6th and a third above the lowest note (the '3' is assumed.)

Note that 'Cm6' (with an explicit letter-name) means something different. That's 'C minor sixth', a C minor triad with an added A.

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