The name of its entry in the Japanese forces book is something of a giveaway.
“TYPE 97 CHI-HA MEDIUM TANK”. :p
It mostly seems to be a criterion of which slot it gets put in armour lists, and/or how it was used, and yes, the bizarrely named “damage value”.
Tank size occasionally crops up in some rules: like a tank ramming a building, or (from the optional campaign books) getting stuck in rubble.
