Answer:
I know a word of letters three. Add two and fewer there will be. What is the word?
I go around a yard but do not move. What am I?
You use me between your head and your toes the more I work the thinner I grow.
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
Draw fire or fill me; I'm still empty.
When someone uses this acronym, you know you've got to pick up the pace