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Degres, a little o at the top of the line
Lennox top o the line furnace is 98.2 percent efficient
This is simply called a line. <---------------O-------------------------------O----------------------> But this is called a line segment: O-------------------------------------------O
This is just to make it easier to tell a 7 with a short top bar from a 1. In French, the number 1 has an exaggerated upstroke (line from left) rather than a single vertical line, and the crossbar is often required to tell a 1 and 7 apart. Similarly, a line may be placed diagonally thru a zero (0) to differentiate it from a capital O : ∅. But in Danish, the exact opposite is done, where a line indicates a capital o (Ø).
o o o o o o o o o Correct answer will not display because text editor does no save leading spaces to allow correct alignment.