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This raises or lowers the middle-ish point of the color curve. The default value is one, with smaller numbers darkening the lower registers and higher numbers lightening them. There is a Gamma node but I find that stand-alone gamma adjustments are best done using ColorLookup so as to give you flexibility over where the ‘grab point‘ of your curve is. Both ColorCorrect and Grade have built in Gamma value sliders.

Below left: a gamma value of 0.5 pushing the middle values darker. Below right: a Gamma value of 1.5 pushing the middle values lighter (as the difference on the ramp is difficult to see I have placed two copies of the original ramp on the bottom row for the purposes of comparison)

A Gamma operation visualised.