Abbreviation of カノン砲 (kanon-hō), a historical term for cannon. Used in military or historical contexts.
from Dutch kanon
An old cannon is on display at this fortress.
Standard katakana spelling for the loanword from Dutch 'kanon'. Usually written in kana.
Ateji (phonetic kanji) spelling; rarely used.
Loanword from Dutch 'kanon', meaning cannon. The ateji spelling 加農 is phonetic.