teetotum
noun
tee·to·tum ˈtē-ˈtō-təm 
: a small top usually inscribed with letters and used in put-and-take
Word History
Etymology
tee entry 1 + Latin totum all, from neuter of totus whole; from the letter T inscribed on one side as an abbreviation of totum (take) all
First Known Use
1720, in the meaning defined above