Answer Happy

Please help interpret this code.
What is a bearing wall?
What are unsupported length and unsupported height?
411.3.1 Minimum Wall Thickness 411.3.1.1 Minimum wall thicknesses shall be in accordance with Table 411.3.1.1. Thinner walls are permitted if adequate strength and stability can be demonstrated by structural analysis Table 411.3.1.1 Minimum Wall Thickness, h Wall type Minimum thickness, h 100 mm Greater Bearing[¹] of: 1/25 the lesser of unsupported length and unsupported height Greater Non-bearing 100 mm of: 1/30 the lesser of unsupported d. length and unsupported height Exterior basement and Foundation [¹] 190 mm e. [1] Only applies to walls designed in accordance with the simplified design method of Section 411.5.3. a. b. C.