Light signals controlling traffic
Motorway signals
8 signals, in the order the Highway Code lists them. Each one has a page of its own, so you can link to a single signal.
Every one, in the order the Code lists them
The rest of light signals controlling traffic
3 more groupsOne search covers the whole Code and the whole library
Nobody looking something up knows whether the answer is a rule or a signal, so there is one field for both, and neither needs an account.