Lanekind
AMBER means ‘Stop’ at the stop line. You may go on only if the AMBER appears after you have crossed the stop line or are so close to it that  to pull up might cause an accident

lanekind.co.uk/road-signs/traffic-light-signals/amber-means-stop-at-the-stop-line-you-may-go-on-only-if-the-amber-appears-after-you-have-crossed-the-stop-line-or-are-so-close-to-it-that-to-pull-up-might-cause-an-accident

Light signals controlling traffic · Traffic light signals

AMBER means ‘Stop’ at the stop line. You may go on only if the AMBER appears after you have crossed the stop line or are so close to it that to pull up might cause an accident

One of 5 signals the Highway Code files under traffic light signals. The other 4 are at the foot of this page.

Category
Light signals controlling traffic
Group
Traffic light signals
Address
/road-signs/traffic-light-signals/amber-means-stop-at-the-stop-line-you-may-go-on-only-if-the-amber-appears-after-you-have-crossed-the-stop-line-or-are-so-close-to-it-that-to-pull-up-might-cause-an-accident

Where these words turn up

Every one of these is the whole text of the pack searched for this name, not a guess at what the sign is about.

The signal before and after this one

The other 4 in traffic light signals

See the group