In aligned system you place the dimensions( or numerals) above the dimension lines so that they can be read from bottom or right edge of your sheet.
In unidirectional system, all the numerals are placed along the dimension lines, all in the same direction such that they can be read from the bottom edge.
This figure explains it clearly: http://www.maelabs.ucsd.edu/mae_guides/cad/dimensioning/Dimensioning_Fundementals_files/image034.gif
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The word 'aligned' is the past participle, past tense of the verb to align.The noun form for the verb to align is alignment.
It depends on the rotation of the square. If it is aligned to the X and Y axes, then there are two horizontal lines. If it is not aligned to the X and Y axes, there are no horizontal lines.
A prism in which the bases are not aligned properly.
metaphase
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