I'm going to be pedantic:

canon 1 |ˈkanən|

noun

1 a general law, rule, principle, or criterion by which something is judged: the appointment violated the canons of fair play and equal opportunity.

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cannon |ˈkanən|

noun

1 (pl. usu. same) a large, heavy piece of artillery, typically mounted on wheels, formerly used in warfare.cannon 1 cannon 1

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Thanks for this. I remember when his son called for everyone to write him a letter just before he passed. A life well lived and well deserved.