- 10 cycle: see heavenly stems
- 12 cycle: Zodiac | see also earthly branches
- 12 semitone musical system: Musical Notation
- A Dictionary of the Chinese Particles (1974): Chinese Linguistics in North America
- A Dissertation on the Nature and Character of the Chinese System of Writing (1838): Western Views of the Chinese Language
- A Grammar of Colloquial Chinese: as Exhibited in the Shanghai Dialect (1868): Chinese Linguistics in North America
- A’-dependency: Empty Categories
- A’-movement: Bèi 被-construction | Movement Structures
- A’-movement, sentence processing: Sentence Processing: …