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Grenzwinkel m
astr.	critical angle
construct.	elevation angle; vertical angle
geomech.	angle of draw; limit angle
meas.inst.	limiting angle
mining.	draw (Bergschadenkunde)
opt.	critical angle (total internal reflection); angular limit
phys.	critical angle (der Totalreflexion, of total reflection); boundary angle; contact angle; rim angle (der Totalreflexion); limiting angle (der Totalreflexion, e.g. of friction)

Grenzwinkel: 3 phrases in 2 subjects

Geomechanics	2
Optics branch of physics	1