Taiwanese Mandarin
Loan words may differ between Putonghua and Taiwanese Mandarin. Different characters or methods may also be chosen for transliteration (phonetical or semantical), even the number of characters may differ. For example, former U.S. President Barack Obama's surname is called "Àobāmǎ" in Putonghua and or "Ōubāmǎ" in Guoyu.