FOSS gamedev and creative worlds

can anyone give description on these types of visual:

1. cube
2. sprite
3. upright_sprite
4. mesh
5. wielditem

i think i already know about no.1 and no.4, but not the others

many thanks in advance

sprite:
- Flat texture
- Always looks at you (like the dropped items in 0.4.9)
upright_sprite:
- Used for 2D-characters,
- You can go around it like a normal player
- Looks like a standing paper
mesh:
- Visuals are defined with a mesh(-file)

cube: a simple cube, like a default node.

wielditem: similar to a wielded or dropped item; is like upright_sprite, but extruded.