T-number - definition of T-number by The Free Dictionary
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(Photography) photog a function of the f-number of a camera lens that takes into account the amount of light actually transmitted by the lens
[from T(otal Light Transmission) Number]
References in periodicals archive
Thus, each representative feature is analyzed in a three-stage procedure that assigns a Tropical Number (T-number) or Dvorak's classification to a disturbance by using both the qualitative description of the intensity and a quantitative description.
This structural evolution along with pressure and wind speed data allowed for tracking a T-number sequence (Table 1).