ᐅ Explaining the Light Switch Layout Plan

Hello friends,
what do these symbols mean?
The front door opens to the left, and the symbols are on the right.
What is their purpose?

Am I understanding this correctly:
Top symbol for the light switch in the stairwell/upper hallway.
Middle switch for the light in the entrance/hallway.
Bottom switch for the outdoor light.

Looking forward to your advice.

Two "flags" mean a two-way switch, one is a standard switch.

What does that mean now?

Wikipedia explains the two-way switch very clearly... Nothing more can be inferred from the diagram, meaning which lamp is controlled by which switch should have been noted or remembered by the electrician.

But these are lamps, right?