Engineering Mechanics
The forces, which meet at one point, but their lines of action do not lie in a plane, are called

Intersecting forces
Non-coplanar concurrent forces
Coplanar non-concurrent forces
Non-coplanar non-concurrent forces

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Engineering Mechanics
Varingon's theorem of moments states that if a number of coplanar forces acting on a particle are in equilibrium, then

Their lines of action are at equal distances
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their algebraic sum is zero
The algebraic sum of their moments about any point in their plane is zero

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