A base character is a character in computing whose appearance is modified by one or more combining characters.

"Printing . a character or type combining two or more letters, as fl and ƕ."

The keyword is "cultural." It is formed from combining the words "culture" and "al," indicating that something has the character or likeness of a particular culture.

The word 国 (guó) is formed by combining the radical for "earth" or "soil" and the character for "king" or "lord." It represents the concept of a country or nation.

Combining. Well, I guess you mean combining pictures, video and music into a video project. That's combining.