These are accepted circuit symbols for reed switches:

How do Reed switches work?

• Reed switches are made up of two metal reeds which have a magnetic material on them.
• The magnetic reeds are not normally touching so the switch is open.
• When you bring a magnet near, the magnetic reeds are attracted together and the switch is then closed.
• Reed switches are used when you don't want a physical switch connected to circuit.
• This might be be due to a dangerously high current in a circuit.

Here is an example of a reed switch being used in a real circuit to turn a bulb on.