What is the foot sign means appear on the head of sim?

I think it means that your sim is down in the boxes at the bottom and tHat it can't be bothered to go

It means that the place you have tapped for your Sim to go cannot be reached. Usually there is furniture in the way, or if you're trying to use something and it does this, the item may be turned the wrong way so the sim can't use it. You can fix this in Build Mode. Just try spacing furniture out a bit more and make sure your Sims can do the things you are wanting them to do.

The foot means the sim can not go to the place you want because something is blocking it's way,

Perhaps you have no door to enter the room or a table or chair is in the way of the place your trying to reach.

hope this helped I am a massive fan to Sims.

That the sim cannot get to where you wanted it to go.

That they can't go where you want, try moving the object your trying to go to and they will go

The foot sign means that there isn't a way or path the sim can go through to get somewhere else. For example, if you don't have any doors, but want your sim to get in the house that sign would appear.

It means they can't walk to whereever you are trying to get them to walk. There is probably something blocking them. It also happens if you want them to use an object that is facing the wrong way because again they can't get to it.

It means that your sim can not get to that place for some reason!
It could be because there is no door or something is in the way of the route it needs to take!
I really hope this helps!