ttc
What is a .ttc file?
font/collection
A TrueType Collection (.ttc) is a single file that bundles several related fonts, sharing common tables (like glyph outlines) to save space. It is used to ship font families or CJK fonts with many variants in one file. A font index selects which face inside the collection to use.
How to use a .ttc file
Use an example .ttc to test collection-aware font loaders, font-index selection, and tools that split a collection back into individual TTF/OTF files.