Recumbent trikes are, as the name suggests three wheelers. They are perhaps more common that recumbent bicycles, in part because balancing is not a problem like on a recumbent bicycle.
Steering varies from traditional bicycle style, to tiller steering and “tank control”.
Like recumbent bicycles, there are a full range of types from road racers, through offroaders. Although technically not a trike, there are a few four wheelers too
If you are interested in giving a trike a go, https://www.pedall.org.uk/ in the New Forest rent them out.
Take a look at https://www.pompeytrikes.co.uk/ as well for Portsmouth based dealer (and former employee) of ICE Trikes.
More to follow