'What is fill-stroke in SVG styling?

I have an SVG drawing that was created by someone else using Inkscape that is rich with styling similar to this example:

<g style="fill:none;fill-stroke:#666666;stroke-width:0.1;">
<path d="M 65.840951,184.29062 V 191.9" />
<path d="m 55.651403,185.86413 v 5.72039" />
<path d="m 53.543313,182.97155 v 2.68529" />
</g>

I don't know what fill-stroke is and a google search produces no results. What is it please?



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