The top
is character Cave (Post 44).
The bottom
is character Bending (Post 225). Why bending? Because the cave is too low, and too much is on the back.
Poor people bend their back to bring heavy coal from small coal mine.
The small seal script for character Poor is
similar to its big seal script
The clerical script for the character is
The top Cave is much smaller and shorter than that in big or small seal scripts, the Bent-body is exposed outside of the cave.
The song typeface for traditional character Poor is
窮
very similar to its clerical scriptThe song typeface for simplified character Poor is
穷
the top is Cave, the bottom is Power of Strength (Post 168), people who live in cave and do manual labor are poor? It may be truth nowadays (simplified characters were created in 1950s).Its Pinyin is Qiong2.