Some 737's and 777's have AOA gauges. At low altitude the stall margin indicator is at approx 1:30 on the AOA gauge. At high altitudes it is at approx 2:45.
As you climb, and Mach compensation comes into play, the AOA limit moves from 1:30 towards 2:45. Under 10,000 at 250 kts it's at 1:30 clock position. Above 10,000 and increasing climb speed, Mach exceeds .4(roughly minimum Mach displayed on the airspeed indicator), at the limit starts changing.
Clock positions equate to roughly 6 units (2:45 position) and 12.5 units(1:30 position). No guidance if 'units' is exactly the same as actual degrees of AOA.