T-SQUARE

A T-square is a technical drawing instrument primarily a guide for drawing horizontal lines on a drafting table. It is also used to guide the triangle that draws vertical lines. Its name comes from the general shape of the instrument where the horizontal member of the T slides on the side of the drafting table. Common lengths are 18", 24", 30", 36" and 42".
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T-Square was an early drafting program written by Peter Samson assisted by Alan Kotok and possibly Robert A. Saunders while they were students at the Massachusetts Institute of Technology and members of the Tech Model Railroad Club.T-Square was written for the PDP-1 computer and its Type 30 precision CRT that Digital Equipment Corporation donated to MIT in 1961. It is unlikely that many people have had the opportunity to use T-Square although Samson has said the group drew some schematics.
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Noun
1. a square used by draftsmen to draw parallel lines
(hypernym) square

t-square
danh từ thước vuông góc, cái ê-ke
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SQUADRA A T