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Bezugsebene f
gen.	reference plane
commun.	basic reference plane
construct.	modular coordination plane
earth.sc., mech.eng.	reference datum
gear.tr.	generating plane
met.	spotting point
phys.	plane of reference
tech.	datum plane; datum level (Andrey Truhachev)
transp., construct.	datum
Bezugsebenen f
med.	lines of reference; planes of reference; points of reference

Bezugsebene: 5 phrases in 4 subjects

Gear train	1
Mechanic engineering	2
Microelectronics	1
Transport	1