what is the symbol for congruent

What is YOUR answer?

one line like this ~

2 lines this under it --

Right. It's a wavy line over an equal sign.

http://etc.usf.edu/clipart/41700/41700/fc_congruent_41700.htm

The symbol for congruent is ≅. It is used to show that two geometric figures or objects are equal in shape and size. If you are looking to input the symbol on a computer, you can use the following steps:

1. Place the cursor where you want to insert the symbol.
2. Press and hold the Alt key.
3. While holding the Alt key, enter the code 8773 using the numeric keypad (on the right side of the keyboard).
4. Release the Alt key, and the ≅ symbol should appear.

On mobile devices, you can typically find the congruent symbol by tapping and holding the "=" key, or by accessing additional symbols and special characters on your keyboard.