Classic Spread Eagle:  Arms and legs are seperated, extending to four corners (for example, extending to each of the four corners of a bed.

Standing Spread Eagle:  Essentially the same as above, except the subject is standing vertically.

Eiffel Tower:  A modified Spread Eagle position.  Subjects legs are spread as described above, the arms are together above the head.  This position is common laying down or standing. 

Note: Spread Eagle is a common BDSM Bondage position