ZZ1000-30
Supplementary plate 1000-30: Both directions

Explanation
The main sign applies to both directions, e.g. traffic or a hazard from the left and from the right.
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Similar signs to tell apart
Supplementary plate 1000-10: Direction (left)
Supplementary plate 1000-20: Direction (right)
Supplementary plate 1000-32: Cyclists crossing from both sides
Supplementary plate 1000-33: Oncoming cyclistsTest yourself on these signs
A one-minute drill: pick the right meaning for each sign.
Legal basis: § 39 StVO