Wikipedia
Adze-on-block (hieroglyph)
The ancient Egyptian Adze on a Wood Block, or Axe in a Block of Wood hieroglyph, Gardiner sign listed no. U20, is a portrayal of the adze. It is used mostly in the cartouches of pharaonic names especially, or other important names.
The adze on block has the Egyptian language value of stp and is the verb "choose". It is used as a determinative in 'stp', "cut into pieces", and as an ideogram for 'stp', "choose", "choice".