The story
Such groups are formed for "technical" reasons, so that members enjoy rights or benefits that would remain unavailable to them outside a formally recognised parliamentary group.
Etymology from Wiktionary, CC BY-SA 4.0.
technical group
Today it means: A heterogeneous parliamentary group composed of elected officials from political parties of differing ideologies (or independent of any party) who are not numerous enough to form groups on their own. Full definition →