Step 1: Understanding Unicode characters.
Unicode characters are special symbols, letters, and signs that represent text in different languages across computer systems. Unicode ensures that characters from different languages and scripts can be displayed and used correctly in applications.
Step 2: Role of Character Map.
The Character Map is a utility program available in many operating systems such as Microsoft Windows. It allows users to view and insert special characters and Unicode symbols into documents or applications.
Using Character Map, users can copy characters such as mathematical symbols, accented letters, currency symbols, and other Unicode characters that are not available directly on the keyboard.
Step 3: Evaluation of options.
(A) Character Display: Incorrect. This is not a standard tool used for inserting Unicode characters.
(B) Character Insert: Incorrect. This program name does not exist as a standard utility.
(C) Character Map: Correct. It allows users to view and insert Unicode characters.
(D) Character Select: Incorrect. This is not a recognized application.
Step 4: Conclusion.
Thus, the program used to enter Unicode characters into any application is Character Map.
Final Answer: Character Map