How many lines of symmetry do alphabets X, I, H, E have?

Question

How many lines of symmetry do alphabets  X, I, H, E have?

anonymous · Answer

X-2
I - 2
H-2
E=1

anonymous · Answer

Define " lines of symmetry"

anonymous · Answer

@NotSObright

anonymous · Answer

Why does X not have 4 lines of symmetry? I understand the vertical and horizontal ones. But why not diagonally?

anonymous · Answer

@FoolForMath a line through any figure that divides it in mirror halve
X as|dw:1330597372140:dw|
If it is like this one below then 4 is answer |dw:1330597416374:dw|

anonymous · Answer

But how do we distinguish between the two? I mean if a question in the exam asks for lines of symmetry of alphabet X, what is one supposed to write?

anonymous · Answer

Cannot say anything about that
Your answer would depend on your interpretation 
If it is asked in homework or exam better write both with proper analogy

anonymous · Answer

Ok, thanks!

anonymous · Answer

just draw a line in the in the exact middle n see if the two sides mirror

anonymous · Answer

The question is not clear and the definition of symmetry is ambiguous.