In Japan, '39' is common text speak for 'thank you', due to how 3 (san) and 9 (kyu) sound when spoken out loud.
Source
In order for MIT students to graduate, they must pass a swim test as it's deemed "a self-survival skill."Source
In Japan, '39' is common text speak for 'thank you', due to how 3 (san) and 9 (kyu) sound when spoken out loud.
Source