Symbols and markings used to represent terrain features on a topographic map.
Topography
Art of mapping the physical features of a region. The topography describes the characteristics of an area, such as its contours, flatness, mountainous, etc.
Topping-cycle
A means to increase the thermal efficiency of a steam electric generating system by increasing temperatures and interposing a device, such as a gas turbine, between the heat source and the conventional steam-turbine generator to convert some of the additional heat energy into electricity.
Topsoil
The top layer of native soil. This term may also apply to good quality soil sold at nurseries and garden centers.
Torch
Various type of heating tools using combustible fuel as a power source.
Torch down roof or single ply or modified bitumen
A newer roofing material mostly used on flat roofs. This material usually comes in rolls and is applied to the roof with an open flame or 'torch'.
Torch soldering
A method of soldering using a torch to provide the heat.
Torching
Applying direct flame to a membrane for the purpose of melting, heating or adhering.
