"Bit" and "byte" are monosyllabic and therefore short enough to throw around.

"Kilobyte" is expressed as "K".

"Megabyte" turns to "meg", and "gigabyte" to "gig".

Is there a convenient/conventional abbreviation for "terabyte" and up? The pace of storage and transfer rate increases has already begun to necessitate such terms, but I am unaware of existing ones.

(The question is also relevant to units of speed, since the above abbreviations are used commonly for words ending in "-hertz" as well.)