Here is a list of all related symbols with links to the classes they belong to:

DataChannel : sf::Ftp
degrees : sf::Angle
Http : sf::Http::Request, sf::Http::Response
operator< : sf::IpAddress, sf::String
operator== : sf::String
radians : sf::Angle
RenderTarget : sf::Drawable, sf::Texture
RenderTexture : sf::Texture
SocketSelector : sf::Socket
Sound : sf::SoundBuffer
SoundBuffer : sf::Sound
TcpListener : sf::TcpSocket
TcpSocket : sf::Packet
Text : sf::Texture
UdpSocket : sf::Packet
Window : sf::WindowBase
WindowBase : sf::Cursor