Vintage Shell petrol pump ephemera at St Mawes tourist attraction, Cornwall, England, UK

Vintage Shell petrol pump and Automobile Association AA sign ephemera at St Mawes tourist attraction, Cornwall, England, UK

Tree lungwort (Lobaria pulmonaria) growing on Hazel (Corylus avellana) Lungwort is an indicator of air pollution as it only grows in clean air. Sutherland, Scotland

Hokkaido, Japan

Hokkaido, Japan

Okinawa, Japan

Paris, France

Kingfisher (Alcedo atthis) Indicator of clean watercourses, male and female at sunrise, perched on branch, courtship, mating, pair formation, habitat, Flying Gem, Middle Elbe River Landscape, Middle Elbe Biosphere Reserve, Saxony-Anhalt, Germany, Europe

Battery empty, battery indicator, battery, iPhone, iOS, smartphone, display, close-up, detail

Direction sign in different directions, distance indicator, Cape Forchu, Yarmouth, Nova Scotia, Canada, North America

German underground hydrant indicator signs on a wall

A car interior, the dashboard, instrument panel, and fuel gauge. A speedometer.

A car interior, the dashboard, instrument panel, and fuel gauge. A speedometer

Weather vane with rooster