Aka Rhipsalis cruciformis.  Unique 3 sided stems Unique 3 sided stems sporting little furry tufts at the nodes becometinged red in strong light. 1/4" baby pink blooms all along the edges in winter sometimes followed by small rose pink fruits.
Rhipsalis are epiphytic true cacti and as such they like crowed roots or moss baskets hanging in a protected spot with ambiant moisture.