brachylogy
the practice of conciseness in speech or writing.
laconism, laconicism
1. the practice of using few words to say much.
2. a laconic utterance. —laconic, n., adj. —laconical, adj.
pauciloquy
Rare. the speaking of few words; taciturnity or brevity. —pauciloquent, adj.
syntomy, syntomia
Rare. brevity; conciseness.
telegraphese
the brief, sometimes cryptic language used in telegrams.