Sorry if it is a silly query. I'm not a local English speaker. I perceive that the picture in all probability refers back to the depth of the constructing, however the place does the abbreviation T come from?
(Supply: Power-efficient Structure by Roberto Gonzalo and Karl J. Habermann p. 93)
https://preview.redd.it/jwenwsulyeah1.png?width=558&format=png&auto=webp&s=626f14ac12563f9ebcc9c3567ac4463b47435042
submitted by /u/Motor_Actuator_6210 [comments]
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