The largest, highest-ranking, or most significant; formerly used in reference to the first character of the Thousand-Character Classic [[千字文|千字文|qian1 zi4 wen2]] being used as a numbering system.

the longest-hitting club in golf; a driver

D size battery

(colloquial) to go to the bathroom; to go pee

A humorous way to refer to one's own legs as a mode of transport, comparing the two legs to the number eleven

Tianwen-1, a Chinese space mission launched in 2020 that successfully placed a robotic rover on Mars

the call sign of any United States Air Force aircraft carrying the President of the United States