10
11
alternative energy
bars
building
closed
electrical component
electricity
eleven
energy conservation
entrance
fence
gate
green power
metal
new
no smoking
no smoking sign
nobody
number
red
renewable energy
security camera
security system
soccer match
soccer stadium
solar
solar cell
solar energy
solar equipment
solar mirror
solar panel
sport
sport event
stadium
technology
ten
track and field stadium
turnstile
wall