A "Nose Manual" is the same trick, but on the nose of the skateboard instead of the tail. A nose manual takes better balance, because of the direction the skateboard is rolling in.
Manuals and nose manuals are flatland skateboarding maneuvers, and were used a great deal in freestyle skateboarding to link tricks into one combo.
Manuals are usually slow and hard to maintain, so manualing a long distance is very impressive. It is also all to easy to lose one's balance while manualing and launch the board out in front or behind, bailing hard.