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MATHEMATICAL SIGNS

Sign Meaning Sample Usage

 Incidence Aa Point A belonged to line a

 Including aA Line a includes point A

 Connection AB = AB Line AB is a result of connection of
points A and B.
 Intersection bc Line b intersects with line c

Parallelism Line m is parallel to line n

‖  Perpendicular 1Σ Line 1 is perpendicular to plane Σ
‖
X Crossing A X b Line a is crossing with line b

= Result K = cd Point K is a result of intersection of
lines c and d
 Coincidence A 1B 1 Projection of point A coincides with
projection of point B
 Angle ABC Angle ABC

 Distance /A,a/ Distance from point A to line a

 Go to other  1 2 Go from plane  1| plane  2
position

Construct K = m Σ Construct K the point of intersection of line
m with plane Σ

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