ACC vs accusative case

ACC

name
  • The government accident compensation scheme in New Zealand, administered by the Accident Compensation Corporation. 

accusative case

noun
  • In English and other modern languages, the case used to mark the immediate object (direct object) on which the transitive verb acts. In Latin grammar, the accusative case (cāsus accūsātīvus) includes functions derived from the Indo-European accusative and lative cases; said Lative Case express concepts similar to those of the English prepositions "to" and "towards". 

How often have the words ACC and accusative case occurred in a corpus of books? (source: Google Ngram Viewer )