What do K and N represent in the representation of reinforcement in slabs on architectural drawings

Structural plate distribution bar symbols usually have: K, M, G, N said, respectively, on behalf of the spacing: wide, wider, moderate, dense (can be so understood). For example, if the distribution bar symbols appear in the board plan as K8, M8, G8, N8, then it is as follows:

1, K stands for wide, the approximate spacing is @200, and 8 is the diameter of the distribution bar 8mm.

2, M stands for wide, the approximate spacing is @180, and 8 is the diameter of the distribution bar 8mm.

3, G stands for moderate, the approximate spacing is @150, and 8 is the diameter of the distribution bar 8mm.

4, G stands for moderate, and the approximate spacing is @150, and 8 is the diameter of the distribution bar 8mm. Diameter 8mm.

4, N stands for dense, the approximate spacing is @100, 8 is the diameter of the distribution bar 8mm

The above is a personal understanding, I hope it will help you.