MEANING OF METRIC PREFIXES
+ Addition or plus Δ Triangle
− Subtraction or minus Ο Circle
× Multiplication . Decimal point
÷ Division or divided by : Ratio
= Is equal to % Per cent
≠ Is not equal to @ At the rate of
> Greater than ∪ Union
< Less than ∩ Intersection
rt.L Right angle ⊂ Subset of
∴ Therefore ⊄ Not a subset of
∈ Belongs to ∉ Does not belong to
⁄ Slash ⁄ ⁄ Parallel to