geometry - Help! I've forgotten my phone's lock pattern!

I have an Android phone with a pattern lock screen, which if you've never seen one allows you to unlock your phone using a pattern drawn on the screen over a 3x3 grid of dots.

So for example, if we number the dots as follows:

1 2 3
4 5 6

7 8 9

then valid lock patterns may be created by drawing lines connecting 1 > 2 > 3 > 4, or 1 > 5 > 9 > 8 > 7.

Note, there are a few rules restricting what constitutes a valid unlock pattern:

• Any given dot can only be used once (however you can cross back over a previously used dot, if you can connect to another unused dot on the other side)
  
  
  
  • Eg. 1 > 2 > 3 is valid, 2 > 1 > 2 is invalid, but 2 > 1 > 3 is valid (goes back over the 2, but doesn't re-include it in the actual code)
  
  
  
  



• If your line crosses directly over a previously unused dot, it is automatically included in the code
  
  
  
  • Eg. Attempting to create a code of 1 > 3 > 4 would automatically become 1 > 2 > 3 > 4
  
  
  
  

What I remember about my specific lock pattern:

1. It used all 9 dots


2. The line representing the pattern has reflective symmetry



3. It is different to my previous pattern which also followed rules 1 & 2


4. My previous pattern looked like an alphanumeric character

What is current my lock pattern? What was my previous lock pattern?

_{For the purposes of this puzzle, we'll ignore the fact that there will be multiple "correct" answers achieved by simply rotating by multiples of 90 degrees. In other words a pattern of 1 > 2 > 3 will be considered identical to 3 > 6 > 9.}

Edit: Given that Len found two valid solutions below, and neither was my intended solution, I've added an extension puzzle with an additional rule.

Answer

Added 4th solution.

I think your previous pattern was:

M which is also called impossible 3 ends shown below - 854693217

And you current pattern is one of:

- a type of star left below - 857342619
- or a geometric pattern center below - 851962473
- or a modified M right below - 254693817