Beta Emblems
From CW-Games Wiki
Original text by jimbo390.
Intro
Mario Kart DS contain beta emblems. Mario's beta emblem is Mario’s head in red with a "M" inside. Also, all kart models in the beta files have a strange emblem, sometimes it’s a number and sometimes it’s not. The number may be for the position of the player. The emblems can be replaced using MKDS Course Modifier.
Media
Some Early Emblems 
Beta Number Emblems Ingame 
Mario's Beta Emblem ingame
