CA or ca may refer to:
Canada (/ˈkænədə/; French: [ka.na.dɑ]) is a country in the northern half of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres (3.85 million square miles), making it the world's second-largest country by total area and the fourth-largest country by land area.
California (/ˌkælᵻˈfɔːrnjə/ KAL-ə-FORN-yə, /ˌkælᵻˈfɔːrniə/ KAL-ə-FAWR-nee-ə) is the most populous state in the United States and the third most extensive by area.
The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with more than 1.27 billion members worldwide.
An electronic calculator is a small, portable electronic device used to perform operations ranging from basic arithmetic to complex mathematics.
The domestic cat (Latin: Felis catus) is a small, typically furry, carnivorous mammal. They are often called house cats when kept as indoor pets or simply cats when there is no need to distinguish them from other felids and felines.
Catherine, Duchess of Cambridge (Catherine Elizabeth "Kate"; née Middleton; born 9 January 1982) is the wife of Prince William, Duke of Cambridge.
Caitlyn Marie Jenner (born October 28, 1949), formerly known as Bruce Jenner, is an American television personality and retired Olympic gold medal-winning decathlete.
Cannabis, also known as marijuana among several other names, is a preparation of the Cannabis plant intended for use as a psychoactive drug or medicine.
Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body.