The word "post" in crochet is referring to the whole stitch--generally a "tall" stitch (such as a double crochet, triple crochet, etc).
The reason the instructions refer to the stitch in the row below, is so the crocheter understands that you are to stitch around the stitch below--the "post" of the stitch. Otherwise, if the instructions stated that you were to double crochet the next stitch, you would understand that you would be double crocheting into the top of the stitch below, versus crochet around the length of the stitch.
You also notice that the instructions will say to "back post double crochet (bpdc)" which means to bring your stitch around the post from the back position. So, "front post, double crochet (fp dc)" would mean to bring your stitch in from the front side of your work.
It means alternate between front post double crochet and back post double crochet.
for back post single crochet - insert hook from back to front around post of next stitch, yarn over and pull up a loop even with last stitch worked and complete single crochet for front post single crochet - insert hook from front to back around post of next stitch, yarn over and pull up a loop even with last stitch worked, and complete single crochet This is easier explained in photographs or video.
what are the terms for crochet
The "x" symbol in crochet means: single crochet (sc)
velour- velvety crochet- hook
My best guess to what you are asking is that you are referring to Front Post and Back Post stitches. This would mean that you sitch around the stitch below the one that you are making. Either by bringing your hook in from the "front" (Front Post) or the "back" (Back Post). The added Links would be good to view to see what is meant by "Front Post" and Back Post.
Its not possible to work around a crochet space because a space has nothing in it. However it is possible to work around a crochet stitch such as the post of the actual crochet stitch. You can work a crochet slip stitch over the top of crochet chains and stitches to get to another place in your crochet piece. You can also work crochet stitches around the post of a stitch. The term working around the space does not make any sense and is not good language for describing written instructions.
In crochet and knitting, RT stands for right twist.
Snot
Picot
A quarter note.
The letters sc are found in crochet instructions and are the abbreviation for "single crochet". The instructions are telling you to make a single crochet stitch in the last stitch of the row you are working.