Thread:SamwiseFilmore/@comment-27219153-20170105071344/@comment-25565811-20170114214738

''MilkMC wrote: ... fltr = from left to right ...''

It was me, who added the captions, when I first uploaded most of those pillar images ages ago (May 7, 2015). The credit for inventing the pillar images has to go to Beijing1000 (August 11, 2014). I just copied her idea for the other types.

I though, fltr was a common abrreviation in English, but it seems not to be as common as I thought.