TMap sounds like a good idea
A TMap is a hash table-like data structure and has nothing inherently to do with tilemaps (which is crushing news, I know, but it turns out that TMaps are cool in their own way). Personally I wouldn't use 'TMap' as the name of a custom type, if only to spare those who who follow in search of information on actual TMaps (hi!). They're cursing you right now.