blua:

n. [abbr. picayune] the smallest measurable unit of human connection, typically exchanged between passing strangers—a flirtatious glance, a sympathetic nod, a shared laugh about some odd coincidence—moments that are fleeting and random but still contain powerful emotional nutrients that can alleviate the symptoms of feeling alone.

(Source: dictionaryofobscuresorrows, via nataliebootlah)