Also known as: TT$
TT has various meanings in the NASA category. Discover the full forms, definitions, and usage contexts of TT in NASA.
A hard shelll produced by some unicellular protists; may be made of calcium carbonate, silica, or sand grains.
NASAThe time it takes between the arrival of a vessel and it's departure from port; frequently used as a measure of port efficiency.
NASALast updated: